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Complete question index

All 400 server questions

Browse the full set of questions in this release. Each link opens one dedicated answer; shared commands have a single page used by both VPS and dedicated-server sections.

400 questions

Choosing the right server

Shared server guidance · Compare server platforms, hardware, operating systems and availability designs against your workload.

  1. Should I choose a VPS, dedicated server or cloud server?
  2. What should I check before choosing a managed or self-managed server?
  3. How do I choose enough CPU and RAM for a server?
  4. How do I compare usable server storage, IOPS and throughput?
  5. Can my application run on an x86 or ARM server?
  6. Should my server use Linux or Windows Server?
  7. How do I know whether I need a GPU server?
  8. Which server location should I choose for my customers?
  9. Is one large server enough, or do I need high availability?
  10. How do I confirm that a server is suitable for my software and licences?

Service, ordering and billing

Shared server guidance · Understand quotations, provisioning, support responsibilities, usage charges and service changes.

  1. What information should I provide for an accurate server quote?
  2. When is a newly ordered server ready to use?
  3. Which server problems are handled by support and which are my responsibility?
  4. What should I check in a server SLA and maintenance policy?
  5. How do bandwidth, traffic allowance and egress charges affect my server bill?
  6. How do I request server IP addresses and confirm reverse DNS support?
  7. Are Windows, control-panel and database licences included with my server?
  8. Can I upgrade or downgrade my server without losing data?
  9. How do I check server renewal or request cancellation?
  10. What should I do if a server is suspended or a payment is still pending?

Recovery planning and validation

Shared server guidance · Understand recovery points, consistency, retention, encryption and tested disaster recovery procedures.

  1. What is the difference between RAID, a server snapshot and a backup?
  2. How do I set RPO and RTO for a server?
  3. What makes a server recovery point application-consistent?
  4. How do I verify that an existing server backup is intact?
  5. How do I test a server restore without affecting production?
  6. Why should server recovery copies be offsite or immutable?
  7. How should I protect encryption keys needed for server recovery?
  8. How long should I retain server recovery points?
  9. How should a server be recovered after ransomware?
  10. What should a server disaster recovery runbook contain?

Migration and cutover planning

Shared server guidance · Prepare dependencies, transfers, database consistency, DNS changes and safe server retirement.

  1. What should I inventory before migrating a server?
  2. How do I size the target server and migration window?
  3. How do I preview a Linux server file migration with rsync?
  4. How do I keep database data consistent during a server migration?
  5. How do I plan DNS changes when moving a server?
  6. How can I test a new web server before changing public DNS?
  7. How should I handle HTTPS certificates when migrating a server?
  8. What should I include when migrating email from a server?
  9. When should I stop or roll back a server migration?
  10. When is it safe to decommission the old server after migration?

Monitoring and incident alerts

Shared server guidance · Measure meaningful health, plan alert ownership and preserve the evidence needed to resolve server incidents.

  1. Why can a server be online while its application is unavailable?
  2. How do I establish a useful performance baseline for a server?
  3. How should I choose server alert thresholds and durations?
  4. What should server disk-capacity monitoring include?
  5. How should I plan server log rotation and retention?
  6. How do I monitor server certificate expiry and renewal health?
  7. Why should I monitor my server from outside its own network?
  8. How do I make sure server alerts reach the right person?
  9. What evidence should I record during a server incident?
  10. What safeguards should automated server remediation have?

Access ownership and security planning

Shared server guidance · Define access roles, protect secrets, isolate workloads and coordinate patching and security incident response.

  1. How should I assign least-privilege access to a server?
  2. How do I remove a departing administrator’s server access safely?
  3. Where should I store passwords, API tokens and other server secrets?
  4. How should I prioritise security updates on a server?
  5. What server access and administrative actions should be logged?
  6. How should I isolate different customers or applications on a server?
  7. What is the difference between encryption at rest and in transit on a server?
  8. Does DDoS protection also protect my server application from attacks?
  9. What should I do if I suspect a server has been compromised?
  10. How can I verify a server vulnerability report safely?

GPU servers and accelerator diagnostics

Dedicated servers · Inspect GPU hardware, compatibility, telemetry and supported sharing without changing live device configuration.

  1. How do I identify the GPUs installed in a dedicated server?
  2. How do I check NVIDIA driver and CUDA compatibility on a dedicated server?
  3. How do I check GPU memory and utilisation on a dedicated server?
  4. How do I check GPU temperature and power limits on a dedicated server?
  5. How do I identify which process is using a dedicated server GPU?
  6. How do I investigate GPU ECC errors or Xid events on a dedicated server?
  7. Why can the dedicated server see a GPU but my container cannot?
  8. Can I share a dedicated server GPU using MIG or passthrough?
  9. How do I inspect GPU topology and PCIe links on a dedicated server?
  10. How do I check AMD ROCm and CPU architecture support on a dedicated server?

Dedicated server workload planning

Dedicated servers · Plan web, database, desktop, mail, gaming, build, storage, cluster and AI workloads for dedicated hardware.

  1. How should I host multiple websites on a dedicated server?
  2. How do I size a dedicated database server for my workload?
  3. What should I check before using a dedicated Windows server for Remote Desktop Services?
  4. What must be ready before a dedicated server sends and receives email?
  5. How do I size a dedicated server for multiplayer games?
  6. How should I isolate CI runners on a dedicated server?
  7. What should I consider when using a dedicated server as a NAS or file server?
  8. How should I protect access to a dedicated backup repository server?
  9. How do I check Kubernetes health on dedicated servers safely?
  10. How do I size a dedicated server for AI inference?

Dedicated hardware & health

Dedicated servers · Verify physical inventory, memory topology and sensor evidence before tuning or replacing dedicated-server components.

  1. How do I verify a dedicated server’s CPU sockets, cores and threads?
  2. What is NUMA, and how do I inspect it on a dedicated server?
  3. How do I investigate ECC or hardware memory errors on a dedicated server?
  4. How do I check installed RAM modules and plan a compatible memory upgrade?
  5. Can I run the same applications on x86 and ARM dedicated servers?
  6. How do I identify PCIe network, storage and GPU devices and their Linux drivers?
  7. How do I record BIOS and management-controller firmware versions before an update?
  8. How do I investigate thermal throttling on a dedicated server?
  9. How do I check whether a dedicated server’s redundant power supplies are healthy?
  10. How do I distinguish a hardware fault from an operating-system problem?

Dedicated storage, RAID & drive health

Dedicated servers · Understand controller and filesystem layers, verify drive identity and diagnose redundancy or endurance issues before physical changes.

  1. How should I choose between RAID 0, 1, 5, 6 and 10?
  2. How do I distinguish hardware RAID, an HBA and Linux software RAID?
  3. How do I map a Linux disk to its physical serial number and drive bay?
  4. How do I read SATA or SAS drive health without starting a disruptive test?
  5. How do I inspect NVMe health, temperature and wear on a dedicated server?
  6. How do I inspect a degraded Linux RAID array without changing it?
  7. Why is a dedicated server slower during RAID recovery or rebuild?
  8. How do I assess SSD endurance and write load on a dedicated server?
  9. Why do raw drive capacity, RAID capacity and filesystem free space differ?
  10. What must be verified before replacing a drive in a dedicated server?

Remote console, BMC & recovery access

Dedicated servers · Use the dedicated server’s management plane deliberately, understand console and virtual-media behaviour, and preserve recovery access.

  1. How is BMC or IPMI access different from SSH access to a dedicated server?
  2. Are Dell iDRAC and HPE iLO interchangeable management tools?
  3. How should I connect to a dedicated server’s management console securely?
  4. Why do characters or pasted commands behave differently in a remote server console?
  5. What does attaching an ISO through dedicated-server virtual media actually do?
  6. How do I check UEFI boot entries before changing a dedicated server’s boot order?
  7. When can Serial over LAN help recover a dedicated server?
  8. What should I check when a dedicated server is powered on but SSH never returns?
  9. What is the difference between an OS shutdown, a reset and a power cycle?
  10. How do I secure BMC access while keeping emergency console recovery available?

Physical networking, bonds & routed IPs

Dedicated servers · Inspect dedicated-server links and network layers, coordinate switch-side requirements and preserve management access during changes.

  1. How do I check a dedicated server NIC’s link speed and duplex?
  2. How do I check a Linux bond and its LACP partner configuration?
  3. How do I verify VLAN tagging on a dedicated server?
  4. How do I inspect a Linux bridge used by virtual machines or containers?
  5. How do I investigate MTU-related connectivity problems?
  6. How should I configure additional IPs or a routed subnet on a dedicated server?
  7. How do I change static networking without losing dedicated-server access?
  8. How do I investigate packet errors or drops on a physical server NIC?
  9. How do I measure network traffic without running a disruptive speed test?
  10. How do I distinguish provider-edge filtering from a local firewall or application failure?

Dedicated virtualization & hypervisors

Dedicated servers · Check hardware support, guest placement and management boundaries for KVM, Proxmox VE, Hyper-V and VMware ESXi.

  1. How do I check whether a dedicated server supports hardware virtualization?
  2. What does a dedicated Linux server need before it can run KVM virtual machines?
  3. What should I check before using a dedicated server as a Proxmox VE host?
  4. How do I check Windows Server Hyper-V prerequisites on a dedicated server?
  5. How do I map a virtual machine’s disks and network interfaces on a dedicated host?
  6. What must I check before assigning a PCIe device directly to a virtual machine?
  7. How should I allocate vCPUs and NUMA resources to virtual machines?
  8. How do I inspect VMware ESXi host inventory through supported access?
  9. What must be compatible before live-migrating a VM between dedicated hosts?
  10. Who needs to patch the hypervisor host and the virtual machines?

Dedicated commissioning & lifecycle

Dedicated servers · Prepare hardware changes, remote-hands work, migrations and retirement with clear identity, ownership and acceptance checks.

  1. What should I verify when a new dedicated server is commissioned?
  2. How do I plan a firmware maintenance window for a dedicated server?
  3. Will a dedicated server CPU or RAM upgrade require downtime?
  4. What evidence should I include in a dedicated-server hardware fault ticket?
  5. How do I know whether a dedicated-server disk can be hot-swapped safely?
  6. What should a remote-hands request specify for a dedicated server?
  7. What should I plan before moving a dedicated-server workload to another datacentre?
  8. How should drive sanitisation be verified before a dedicated server is returned?
  9. What should I check before cancelling or returning a dedicated server?
  10. How should I plan hardware lifecycle, spare capacity and high availability?

Linux files & text commands

Shared server guidance · Navigate, inspect, edit and organise server files with explicit paths and carefully scoped changes.

  1. How do I check which directory I am in on a Linux server?
  2. How do I list hidden files, permissions and file sizes on a server?
  3. How do I create a directory and nested folders on a Linux server?
  4. How do I copy or rename a selected Linux file without silently overwriting another?
  5. How do I read a large server file without opening it in an editor?
  6. How do I search for a literal error message inside a Linux text file?
  7. How do I find a server file by its name without searching the whole system?
  8. How do I edit a text file over SSH using nano?
  9. How do I compare text files and check whether two downloads are identical?
  10. How do I remove one selected Linux file or an empty directory safely?

Linux users, ownership & permissions

Shared server guidance · Understand server identities, sudo rights, file ownership and targeted access changes without weakening shared services.

  1. How do I check which Linux user and groups my SSH session is using?
  2. How do I create a named Linux account instead of sharing a root login?
  3. How do I check what sudo commands I am allowed to run?
  4. How should I add a narrowly scoped sudo rule without breaking administrator access?
  5. How do Linux read, write and execute permissions work for files and directories?
  6. How do I change permissions on one Linux file without affecting an entire application?
  7. How do I correct ownership of a selected Linux file?
  8. How do I add a Linux user to one group without removing their other groups?
  9. How do I check ACLs and the umask when Linux permissions seem unexpected?
  10. How do I review an old Linux account before removing its access?

Packages, updates & system information

Shared server guidance · Identify the operating system, inspect package state and plan controlled updates with the correct distribution tools.

  1. How do I identify a server’s Linux distribution, kernel and CPU architecture?
  2. How do I check whether a Linux package is installed and which version it uses?
  3. How do I check pending Linux updates without installing them?
  4. How do I install one approved Linux utility and review its dependencies first?
  5. How do I preview a Linux upgrade before scheduling maintenance?
  6. What should I do when APT says another process holds the package lock?
  7. How do I investigate an interrupted Debian or Ubuntu package installation?
  8. How do I check which repository supplies a Linux package?
  9. How do I tell whether a kernel update is installed but not yet running?
  10. How do I check server time, timezone and clock synchronisation?

Processes, services & scheduled jobs

Shared server guidance · Inspect running work, control the intended service and verify recurring jobs without interrupting unrelated applications.

  1. How do I list running Linux processes and identify their owner?
  2. How do I stop one confirmed Linux process gracefully?
  3. How do I check whether a Linux service is running, failed or missing?
  4. When should I reload a Linux service instead of restarting it?
  5. What is the difference between starting a service and enabling it at boot?
  6. How do I validate a systemd unit file and make systemd notice an approved edit?
  7. How do I view and edit a Linux user’s scheduled cron jobs safely?
  8. How do I find systemd timers and check whether their jobs actually ran?
  9. How do I keep an interactive Linux task available after an SSH disconnection?
  10. How do I schedule a graceful Linux server reboot and cancel it if necessary?

Logs & incident diagnosis

Shared server guidance · Find the relevant service, boot and kernel evidence, correlate timestamps and preserve useful incident context.

  1. How do I read recent logs for one Linux service?
  2. How do I inspect the previous boot after a Linux server restarts unexpectedly?
  3. How do I inspect kernel messages for storage, memory or driver errors?
  4. How do I review SSH authentication events on a Linux server?
  5. How do I watch a Linux log file as new events are written?
  6. How do I correlate server logs when systems use different timezones?
  7. How do I investigate a Linux server that takes too long to boot?
  8. How do I check journal disk usage before changing log retention?
  9. How do I find where a Linux application sends its logs?
  10. What command output should I collect for a Linux server support incident?

CPU, memory & performance

Shared server guidance · Measure resource pressure, distinguish guest and host constraints, and choose tuning changes from evidence rather than fixed percentages.

  1. How do I check CPU usage on a Linux server without interrupting workloads?
  2. What does Linux load average mean, and how is it different from CPU percentage?
  3. Why does Linux show high memory usage even when the server is healthy?
  4. How do I check whether Linux killed a process because of memory pressure?
  5. How do I tell whether swap is contributing to a slow Linux server?
  6. What is CPU steal time on a VPS, and can an application fix it?
  7. How do I check whether disk I/O is slowing a Linux server?
  8. How do I find which Linux process is generating disk I/O?
  9. How do I check whether a service has CPU, memory or task limits below the server total?
  10. How should I choose worker counts and memory limits for a server application?

Disk space, storage & filesystems

Shared server guidance · Map storage layers, diagnose capacity and mount problems, and prepare filesystem changes from the verified layout.

  1. How do I check free disk space on the filesystem an application actually uses?
  2. Why does Linux say no space left when disk gigabytes are still available?
  3. How do I find which directories consume space without crossing other mounted filesystems?
  4. Why did deleting a large log file fail to release disk space?
  5. How do I map Linux disks, partitions, logical volumes and mountpoints?
  6. What must I check before expanding a Linux server filesystem?
  7. How do I check a persistent Linux mount configuration before rebooting?
  8. Why has a Linux filesystem become read-only?
  9. How do I inspect and extract a trusted archive into a separate directory?
  10. How do I check a Linux user or project quota when writes fail?

Linux networking & DNS

Shared server guidance · Inspect addresses, routing, DNS, IPv4 and IPv6, reachability and targeted network traces.

  1. How do I find the IP addresses and interfaces on my Linux server?
  2. How do I check the default gateway and route used by my Linux server?
  3. How do I see which services are listening on a Linux server?
  4. Why does a Linux application resolve a hostname differently from dig?
  5. How do I check A, AAAA, MX, TXT and reverse DNS records from a server?
  6. How do I inspect the DNS servers used by systemd-resolved?
  7. How do I test basic reachability and packet loss from a Linux server?
  8. How do I trace a Linux server’s network path and investigate MTU problems?
  9. How do I find out whether a server problem affects IPv4 or IPv6?
  10. How do I capture a small, targeted network trace on a Linux server?

Firewall rules & secure exposure

Shared server guidance · Understand firewall ownership, narrowly scoped access rules, SELinux denials and authentication-related blocking.

  1. How do I identify which firewall manages my Linux server?
  2. How do I read UFW firewall rules without changing them?
  3. How do I allow SSH from one administrator IP using UFW?
  4. How do I allow a public HTTPS service through UFW?
  5. How do I remove one obsolete UFW rule without resetting the firewall?
  6. How do I check the firewalld zone protecting a server interface?
  7. How do I open HTTPS in firewalld and make the rule persist?
  8. How do I inspect nftables rules without flushing or changing them?
  9. How do I investigate an SELinux denial without disabling SELinux?
  10. How do I check whether Fail2Ban blocked a legitimate administrator?

Nginx, Apache & PHP

Shared server guidance · Identify the web stack, validate scoped configuration changes and diagnose routing, PHP and gateway errors.

  1. How do I identify the web server and PHP runtime on a Linux server?
  2. How do I test and reload Nginx configuration safely?
  3. How do I test and reload Apache on Ubuntu or a RHEL-family server?
  4. How do I check which Apache virtual host serves a domain?
  5. How do I diagnose a 403 Forbidden response on a server?
  6. How do I diagnose a 404 response when a file or application route should exist?
  7. How do I diagnose a PHP website returning HTTP 500?
  8. How do I diagnose a 502 Bad Gateway response from Nginx?
  9. How do I diagnose a 504 Gateway Timeout on a server?
  10. How do I check PHP-FPM service and socket health?

HTTPS, certificates & HTTP

Shared server guidance · Verify TLS, diagnose redirects, inspect certificates, plan ACME renewal and test HTTPS origins safely.

  1. How do I inspect an HTTP redirect chain from PowerShell?
  2. How do I verify the live TLS certificate served by a hostname?
  3. How do I inspect a certificate file and check whether it expires soon?
  4. How do I test an HTTPS origin server before changing DNS?
  5. How do I check which certificates Certbot manages and whether renewal is scheduled?
  6. How do I test a Certbot renewal without replacing the live certificate?
  7. How do I obtain a certificate with Certbot’s webroot method?
  8. How do wildcard certificates and DNS-01 validation work?
  9. How do I diagnose a certificate verification failure without bypassing TLS checks?
  10. How do I check whether a server sends a valid HSTS header?

MySQL, PostgreSQL & database access

Shared server guidance · Connect with protected credentials, inspect metadata and waits, and distinguish network readiness from authorised database access.

  1. How do I connect to MySQL from the server without exposing a password in the command?
  2. How do I list MySQL databases and table structure without reading customer records?
  3. How do I review the permissions of my current MySQL account?
  4. How do I inspect MySQL connections and long-running work without killing queries?
  5. How do I diagnose MySQL Access denied errors?
  6. How do I connect to PostgreSQL with psql and verify the database?
  7. Does pg_isready prove that my PostgreSQL login works?
  8. How do I inspect PostgreSQL schemas and table structure in psql?
  9. How do I inspect PostgreSQL sessions waiting on locks?
  10. How do I access a server’s PostgreSQL database through a local SSH tunnel?

Docker, deployments & automation

Shared server guidance · Inspect containers, logs and storage; validate Compose; and apply focused deployments with clear persistence and access boundaries.

  1. How do I check Docker versions and find the containers on the intended server?
  2. How do I read recent Docker container logs without flooding the terminal?
  3. How do I check a Docker container’s CPU and memory usage?
  4. How do I run a diagnostic command inside a Docker container?
  5. How do I publish a Docker web port only on localhost?
  6. How do I validate a Docker Compose configuration without starting containers?
  7. How do I update one Docker Compose service without restarting its unrelated dependencies?
  8. How do I find what Docker is using disk space for without deleting anything?
  9. How do I identify where a Docker container stores persistent data?
  10. How do I build a Docker image without accidentally including secrets?

VPS architecture & service choices

VPS · Understand virtual resources, service boundaries and the platform details that shape a VPS deployment.

  1. Is my VPS a virtual machine or a system container?
  2. Does one VPS vCPU mean one dedicated physical core?
  3. How should I compare shared and dedicated CPU VPS plans?
  4. What are VPS memory ballooning and host overcommit?
  5. Why can a VPS be fast briefly and slower under sustained load?
  6. What is the difference between local and network-backed VPS storage?
  7. What should I clarify before choosing managed or unmanaged VPS service?
  8. How do I choose the correct VPS operating-system image and architecture?
  9. Does a VPS automatically stay online if its physical host fails?
  10. Which VPS settings can I change inside the guest operating system?

VPS ordering & first boot

VPS · Follow the service lifecycle from a reviewed order to a verified guest, with clear boundaries around first-boot and destructive actions.

  1. What information should I prepare before ordering a VPS?
  2. Why is my VPS order still pending or provisioning?
  3. What should I verify on the first boot of a Linux VPS?
  4. How does SSH public-key injection work when creating a VPS?
  5. How do I check whether cloud-init completed on my VPS?
  6. Is the VPS control-panel name the same as its Linux hostname?
  7. Why can I open the VPS console but not connect with SSH?
  8. What is the difference between stopping, shutting down and rebooting a VPS?
  9. What happens to my data when I reinstall a VPS?
  10. What should I check before cloning a VPS into another instance?

VPS resizing & resource limits

VPS · Plan virtual-resource changes, verify guest capacity and distinguish application limits from provider-controlled allocation.

  1. How do I plan a VPS CPU or RAM upgrade?
  2. Can VPS CPU and memory changes take effect without a restart?
  3. How do I use extra disk space after a VPS disk upgrade?
  4. Can I reduce the size of my VPS?
  5. How do I expand a Windows Server VPS data volume with PowerShell?
  6. Why can an application be limited when my VPS still has spare resources?
  7. Is a VPS bandwidth allowance the same as network speed?
  8. How do I tell whether a VPS is hitting disk IOPS or throughput limits?
  9. Does adding swap increase my VPS RAM allocation?
  10. Should I resize one VPS or add more VPS instances?

VPS network layers & addressing

VPS · Understand guest and provider networking, assigned addresses, recovery access and the checks needed before a network change.

  1. Do I need to check both the VPS firewall and the provider firewall?
  2. Why is my VPS’s guest IP different from its public connection address?
  3. Can I move a VPS IP address to another instance for failover?
  4. How do I check IPv6 on a VPS?
  5. How do I check or request reverse DNS for my VPS IP?
  6. Should my VPS use DHCP or a static IP configuration?
  7. How do I recover a VPS after a network configuration change?
  8. Can an MTU problem make a VPS connection partly work?
  9. Why is a VPS port unreachable even when the guest firewall allows it?
  10. How can two VPS instances communicate privately?

VPS recovery & restore verification

VPS · Assess recovery-point scope, use authorised rescue paths and prove data and application recovery without accidental production changes.

  1. Is a VPS snapshot the same as an independent backup?
  2. Will a running VPS snapshot contain a consistent database?
  3. Should I restore a VPS in place or into a separate instance?
  4. How do I use rescue access when my VPS will not boot?
  5. How do I recover from an SSH lockout on a VPS?
  6. How do I investigate a VPS that stops at a filesystem error during boot?
  7. What should I do if a VPS resize fails or capacity does not appear?
  8. What evidence should I send when I suspect a VPS host problem?
  9. Can I recover my VPS in another region?
  10. How should I verify that my VPS recovery process actually works?

VPS operating systems & specialist workloads

VPS · Check OS support and platform capabilities before relying on containers, nested guests, accelerators, VPNs or specialised services.

  1. Which Linux distribution should I use for a VPS?
  2. Can I run Windows Server and Remote Desktop on a VPS?
  3. Can I use FreeBSD or another BSD operating system on a VPS?
  4. Can I run Docker or other containers inside a VPS?
  5. Can I run another virtual machine inside my VPS?
  6. Can I add a GPU to a VPS for AI or graphics workloads?
  7. Can I run a VPN that needs TUN or TAP on my VPS?
  8. Why can I not load a kernel module inside my VPS?
  9. What should I confirm before hosting email on a VPS?
  10. Is a VPS suitable for a game server or real-time application?

Windows CMD & PowerShell essentials

Shared server guidance · Choose the right Windows shell, identify your tools, and understand where server commands actually run.

  1. Should I use CMD, PowerShell or Windows Terminal for server work?
  2. How do I know whether a command runs locally or on the server?
  3. How do I check whether OpenSSH Client is installed on Windows?
  4. How do I install the OpenSSH client using PowerShell?
  5. Why does Windows say ssh is not recognised?
  6. How do I check my PowerShell and SSH client versions?
  7. How do I use SSH key paths that contain spaces on Windows?
  8. How do I find my Windows profile and .ssh folder?
  9. How do I find help for an unfamiliar server command?
  10. How do I check whether an SSH command succeeded in CMD or PowerShell?

SSH connections & host verification

Shared server guidance · Connect to the correct server, verify its identity, and use clear, repeatable SSH connection settings.

  1. How do I connect to a Linux server from Windows with SSH?
  2. How do I connect when SSH uses a different port?
  3. How do I choose a particular private key when connecting?
  4. How do I verify an SSH host fingerprint before the first login?
  5. How do I inspect a saved SSH known-host entry?
  6. What should I do when SSH says the host key has changed?
  7. How do I create a reusable SSH alias on Windows?
  8. How do I see the SSH settings that will actually be used?
  9. How do I run one server command from CMD or PowerShell?
  10. How do I connect through an authorised SSH jump host?

SSH keys & authentication

Shared server guidance · Generate, protect, enrol and retire SSH keys without exposing private credentials or losing verified access.

  1. How do I generate an SSH key on Windows?
  2. Which SSH key file can I share with the server administrator?
  3. How do I compare SSH key fingerprints without exposing private keys?
  4. How do I add my Windows public key to an existing Linux account?
  5. What permissions should my Linux SSH key files have?
  6. How do I inspect and tighten a private SSH key’s Windows permissions?
  7. How do I use the Windows SSH agent for a passphrase-protected key?
  8. How do I stop SSH offering the wrong keys?
  9. How do I replace an SSH key without losing access?
  10. How do I revoke a lost or exposed SSH private key?

SSH errors & session reliability

Shared server guidance · Diagnose connection and authentication failures using bounded checks, then keep legitimate administration sessions reliable.

  1. Why does my SSH connection time out?
  2. Why does SSH return connection refused?
  3. Why does SSH say Permission denied (publickey)?
  4. Why does SSH report too many authentication failures?
  5. Why does SSH say it could not resolve the hostname?
  6. Why does SSH report an invalid private-key format?
  7. Why does SSH reject my private key because of permissions?
  8. How do I collect useful SSH diagnostic output safely?
  9. How do I reduce idle SSH disconnects?
  10. How do I keep a Linux terminal session after SSH disconnects?

SCP, SFTP & file transfers

Shared server guidance · Transfer files between Windows and servers, verify integrity, and preserve destination permissions and existing data.

  1. How do I upload a file from Windows to a Linux server?
  2. How do I download a server file to Windows with SCP?
  3. How do I copy a directory using SCP?
  4. How do I use a custom SSH port and key with SCP or SFTP?
  5. How do I use the interactive SFTP prompt?
  6. How do I resume an interrupted file transfer with SFTP?
  7. How do I verify that a file transferred correctly?
  8. Why does SCP or SFTP say permission denied when SSH works?
  9. How do I transfer a file into a protected application directory?
  10. How do I preview a server-to-server file copy with rsync?

Windows network & HTTP diagnostics

Shared server guidance · Test the client-side network path, DNS answers, TCP ports and HTTP responses before changing a remote server.

  1. How do I test whether a server TCP port is reachable from Windows?
  2. How do I check server latency with ping from Windows?
  3. How do I trace the network route to a server from Windows?
  4. How do I check a server’s DNS records from Windows?
  5. When should I clear the Windows DNS cache for a server?
  6. How do I inspect my Windows IP address, gateway and DNS servers?
  7. How do I identify the Windows process using a local TCP port?
  8. How do I compare IPv4 and IPv6 connectivity from Windows?
  9. How do I check a website’s HTTP status from Windows?
  10. How do I check whether a Windows proxy affects my server tests?

Windows Server administration

Shared server guidance · Inspect Windows server resources, services, event logs, remote access and operating-system maintenance from PowerShell.

  1. How do I identify my Windows Server version and last boot time?
  2. How do I inspect CPU and memory usage on a Windows server?
  3. How do I inspect and restart one Windows server service?
  4. How do I read recent Windows server errors with PowerShell?
  5. How do I check whether a Windows scheduled task ran?
  6. How do I inspect Windows firewall rules affecting SSH?
  7. How do I check the OpenSSH server on Windows Server?
  8. How do I diagnose a Windows Server RDP connection problem?
  9. How do I check installed Windows Server hotfixes?
  10. How do I open a PowerShell remoting session over SSH?