Unexpected reboot of Proxmox host

Feb 10, 2026
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Hi Proxmox community,

we are new using Proxmox and need your help now. Unfortunately we had an unexpected Proxmox host reboot.
Here are the facts:
- Proxmox Version 9.1.4
- Host is in a cluster with 2 others, HA worked
- Reboot was Feb 10, 08:18:18 - 08:18:21

System log:
Feb 10 08:18:15 opspsrv513 sshd-session[3963687]: Accepted password for root from 193.141.181.62 port 59590 ssh2
Feb 10 08:18:15 opspsrv513 sshd-session[3963687]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Feb 10 08:18:15 opspsrv513 systemd[1]: Created slice user-0.slice - User Slice of UID 0.
Feb 10 08:18:15 opspsrv513 systemd[1]: Starting user-runtime-dir@0.service - User Runtime Directory /run/user/0...
Feb 10 08:18:15 opspsrv513 systemd-logind[2529]: New session 40233 of user root.
Feb 10 08:18:15 opspsrv513 systemd[1]: Finished user-runtime-dir@0.service - User Runtime Directory /run/user/0.
Feb 10 08:18:15 opspsrv513 systemd[1]: Starting user@0.service - User Manager for UID 0...
Feb 10 08:18:15 opspsrv513 (systemd)[3963693]: pam_unix(systemd-user:session): session opened for user root(uid=0) by root(uid=0)
Feb 10 08:18:15 opspsrv513 systemd-logind[2529]: New session 40234 of user root.
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Queued start job for default target default.target.
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Created slice app.slice - User Application Slice.
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Reached target paths.target - Paths.
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Reached target timers.target - Timers.
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Listening on dirmngr.socket - GnuPG network certificate management daemon.
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Listening on gpg-agent-browser.socket - GnuPG cryptographic agent and passphrase cache (access for web browsers).
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Listening on gpg-agent-extra.socket - GnuPG cryptographic agent and passphrase cache (restricted).
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Starting gpg-agent-ssh.socket - GnuPG cryptographic agent (ssh-agent emulation)...
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Starting gpg-agent.socket - GnuPG cryptographic agent and passphrase cache...
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Listening on keyboxd.socket - GnuPG public key management service.
Feb 10 08:18:17 opspsrv513 systemd[3963693]: Starting ssh-agent.socket - OpenSSH Agent socket...
Feb 10 08:18:18 opspsrv513 systemd[3963693]: Listening on gpg-agent-ssh.socket - GnuPG cryptographic agent (ssh-agent emulation).
Feb 10 08:18:18 opspsrv513 systemd[3963693]: Listening on gpg-agent.socket - GnuPG cryptographic agent and passphrase cache.
Feb 10 08:18:18 opspsrv513 systemd[3963693]: Listening on ssh-agent.socket - OpenSSH Agent socket.
Feb 10 08:18:18 opspsrv513 systemd[3963693]: Reached target sockets.target - Sockets.
Feb 10 08:18:18 opspsrv513 systemd[3963693]: Reached target basic.target - Basic System.
Feb 10 08:18:18 opspsrv513 systemd[3963693]: Reached target default.target - Main User Target.
Feb 10 08:18:18 opspsrv513 systemd[3963693]: Startup finished in 2.334s.
Feb 10 08:18:18 opspsrv513 systemd[1]: Started user@0.service - User Manager for UID 0.
Feb 10 08:18:18 opspsrv513 systemd[1]: Started session-40233.scope - Session 40233 of User root.
Feb 10 08:18:18 opspsrv513 sshd-session[3963719]: Received disconnect from 193.141.181.62 port 59590:11: Connection terminated by the client.
Feb 10 08:18:18 opspsrv513 sshd-session[3963719]: Disconnected from user root 193.141.181.62 port 59590
Feb 10 08:18:18 opspsrv513 sshd-session[3963687]: pam_unix(sshd:session): session closed for user root
Feb 10 08:18:18 opspsrv513 systemd[1]: session-40233.scope: Deactivated successfully.
Feb 10 08:18:18 opspsrv513 systemd-logind[2529]: Session 40233 logged out. Waiting for processes to exit.
Feb 10 08:18:18 opspsrv513 systemd-logind[2529]: Removed session 40233.
-- Reboot --
Feb 10 08:24:21 opspsrv513 kernel: Linux version 6.17.4-2-pve (build@proxmox) (gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44) #1 SMP PREEMPT_DYNAMIC PMX 6.17.4-2 (2025-12-19T07:49Z) ()
Feb 10 08:24:21 opspsrv513 kernel: Command line: BOOT_IMAGE=/boot/vmlinuz-6.17.4-2-pve root=/dev/mapper/pve-root ro quiet



Let me know what else you need to helpe me troubleshot this.

Best regards,
Christian