Error 27 when connecting to Proxmox LXC running Minarca
Alexander Webb
Minarca v7, updated on both sides.
Proxmox 9.2.4
Minarca log shows no error:
Patrik Dufresne
Hello Alexander,
Sorry for the trouble you face configuring Minarca on Proxmox LXC.
For reference, error 27: https://nexus.ikus-soft.com/repository/archive/minarca/7.0.0/doc/minarca-client-errors.html#remoteservertruncatedheader-error-27
Message: The connection was terminated unexpectedly, which may indicate an issue with the remote server. If the problem persists, contact your system administrator to review the server logs and diagnose the cause.
Description:
This error occurs when the remote server terminates the connection unexpectedly.
During a backup, this may happen occasionally if the connection is interrupted. However, if the issue occurs while configuring a new connection, it likely indicates a problem with the remote server.
To troubleshoot, check the server logs:
-
Verify SSH authentication in
/var/log/auth.log. -
Verify connection is successful in
/var/log/minarca/shell.log.
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In case of a Proxmox deployment in LXC, most likely, you forgot
to enable user namespaces:
https://nexus.ikus-soft.com/repository/archive/minarca/7.0.0/doc/installation.html#enable-unprivileged-user-namespace-for-containers
features: nesting=1
Minarca Windows client connects to the Proxmox LXC that Minarca is installed to, but is booted off after successfully checking username/pass are correct.[2026-07-17 10:22:25,534][INFO ][IP REDACTED][anonymous][CP Server Thread-8][rdiffweb.core.notification] User REDACTED login to web application [2026-07-17 10:22:25,536][INFO ][-][-][ThreadPoolExecutor-0_0][apscheduler.executors.default] Running job "_log_user_login (trigger: date[2026-07-17 10:22:25 PDT], next run at: 2026-07-17 17:22:25 UTC)" (scheduled at 2026-07-17 17:22:25.202390+00:00) [2026-07-17 10:22:25,540][INFO ][-][-][APScheduler][apscheduler.scheduler] Removed job 35e55196298845a29580a0be0362d76d [2026-07-17 10:22:25,569][INFO ][-][-][ThreadPoolExecutor-0_0][apscheduler.executors.default] Job "_log_user_login (trigger: date[2026-07-17 10:22:25 PDT], next run at: 2026-07-17 17:22:25 UTC)" executed successfully
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