/var/log/univention/listener.log you notice the following warnings:
# LISTENER WARN : replication: Can't contact LDAP server: retrying
As this message is a warning and there might be no need for further action.
To verify the listener/ notifier replication is working fine use the check command:
root@ucs:/usr# /usr/lib/nagios/plugins/check_univention_replication OK: replication complete (nid=2698 lid=2698)
If it gives an “OK” the replication is working.
If not, proceed with this article.
The warning indicates there is an issue connection to the LDAP server which seems to resolve a little bit later. It is recommended to do some troubleshooting steps to figure out the root cause. It might be related to:
- DNS resolving issues
- Network outages
- Server overlad
- Routing or Firewall issues