Knowledge base
VPS access and diagnosis
Diagnose VPS access problems while preserving recovery access.
Search all articlesDiagnose an SSH refusal or timeout on a VPS
Distinguish SSH connection refused, timeout and authentication failure on a VPS using panel, console and network evidence before making a change.
Read the guide →VPS access and diagnosisCheck whether a VPS is running or stopped
Check whether a Virtualizor VPS is Running, Stopped or suspended before diagnosing guest boot, network and application availability.
Read the guide →VPS access and diagnosisUnderstand a VPS reboot versus a power cycle
Choose between a graceful VPS reboot and a forced power cycle after checking the operator, recovery path and risk to current writes.
Read the guide →VPS access and diagnosisInvestigate a VPS that will not boot
Use a Virtualizor console to distinguish a bootloader, filesystem, platform or network fault before attempting VPS boot recovery.
Read the guide →VPS access and diagnosisCheck whether a VPS disk is full
Use df block and inode readings on the affected Linux VPS filesystem to investigate No space left on device without deleting evidence.
Read the guide →VPS access and diagnosisCheck CPU and memory pressure on a VPS
Compare Virtualizor CPU and memory readings with the VPS workload and exact incident time before changing an application or VM size.
Read the guide →VPS access and diagnosisUnderstand who can change a managed VPS
Check the accepted VM Start with Managed OS order to identify customer root and application work, Novasean OS work and change owners.
Read the guide →VPS access and diagnosisCheck an SSH host-key change before accepting it
Verify a changed SSH host-key fingerprint through a trusted route before replacing the saved key after a VPS rebuild or rotation.
Read the guide →VPS access and diagnosisRecover when a VPS has no network access
Gather Virtualizor console, assigned-address and service evidence when a running VPS has no network access across several services.
Read the guide →VPS access and diagnosisUse SSH keys for authorised VPS access
Create and install an SSH public key for an authorised VPS account, then test a new login without losing the existing access route.
Read the guide →VPS access and diagnosisScope an application deployment account
Define an application deployment account with narrow file, database and system permissions and a controlled acceptance check.
Read the guide →VPS access and diagnosisDiagnose VPS name resolution when IP connectivity works
Diagnose DNS lookup failures inside an Ubuntu VPS when address-level connectivity works, without changing the wrong resolver.
Read the guide →VPS access and diagnosisFix SSH Permission denied (publickey) on a VPS
Investigate SSH Permission denied (publickey) by checking the effective target, account, offered key and authorised server evidence.
Read the guide →VPS access and diagnosisRead systemd service status after a VPS outage
Read systemctl status and the matching journal for a Linux VPS service after an outage before restarting or changing configuration.
Read the guide →VPS access and diagnosisUpgrade Ubuntu on a VPS without losing your recovery path
Plan an Ubuntu VPS release upgrade with component compatibility, tested recovery and application acceptance checks.
Read the guide →VPS access and diagnosisFind why a VPS process was killed by out-of-memory handling
Confirm whether a VPS process termination was caused by kernel, cgroup or systemd-oomd memory handling before changing capacity.
Read the guide →VPS access and diagnosisNovasean’s position on cloud sovereignty and customer autonomy
Novasean’s hosting and backup locations, what remains incomplete, and the planned move of client-portal backups from Canada to EU storage.
Read the guide →VPS access and diagnosisDiagnose high disk I/O wait on a Linux VPS
Use repeated iostat and vmstat samples to investigate a slow VPS with free disk space, without mistaking one metric for proof of a storage fault.
Read the guide →VPS access and diagnosisNginx 502 after PHP-FPM restart on a VPS? Check the service and socket
Diagnose an Nginx 502 after a PHP-FPM or VPS restart by checking the authorised service, FastCGI socket, logs and owner.
Read the guide →VPS access and diagnosisHow to move a VPS to another provider: a migration checklist
Plan a VPS move with a verified backup, final data sync, DNS cutover and rollback route. Check why a virtual-machine image may not move as-is.
Read the guide →VPS access and diagnosisVPS application port not reachable? Check the listener and firewall
Trace an unreachable VPS application port through the service listener, address family, container mapping and approved firewall layers before exposing it.
Read the guide →VPS access and diagnosisNGINX 504 Gateway Timeout on a VPS: find the stalled upstream
Trace a VPS 504 to the gateway and upstream request, check the actual timeout stage and repair the cause before changing NGINX limits.
Read the guide →VPS access and diagnosisCan a VPS provider see your files? What Novasean can verify
Understand VPS provider access to files, live applications and backups, what encryption changes, and which Novasean access facts remain unverified.
Read the guide →VPS access and diagnosisHow to add a swap file to an Ubuntu VPS safely
Check whether swap will help, create and verify a guest-level Ubuntu swap file, and avoid disk, filesystem and restart mistakes.
Read the guide →VPS access and diagnosisCheck time synchronisation on an Ubuntu VPS
Check whether an Ubuntu VPS clock is synchronised, identify chrony or timesyncd, and collect useful evidence before changing time settings.
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