Linux : Zimbra backup return error ServiceException: system failure: exception during auth

By | November 16, 2013

Having this error with Zimbra backups?

This might be caused by the Zimbra user cannot establish a loopback SSH connection to the server. Zimbra rely on the network interface IP to establish the connection to himself.

This can happen when :

– You changed the default SSH port and you did not changed it in /etc/ssh/ssh_config

– You restricted the connections to specific users with “AllowUsers” or “AllowGroups”

– Your firewall is blocking the connection

I do not recommend allowing the “zimbra” user to log through SSH from anywhere, so you should restrict it to your server IP only in /etc/ssh/sshd_config as followed :

(Replace with your server IP)