Hi Marc, Thanks for your response. Yes - it's always the 4 hubs that are responsible for authentication. Apart from the following recurring errors in the errors log, there aren't any other signs of stress on the system - CPU and memory look OK; nothing unexpected in /var/log/messages: [24/Dec/2019:07:55:36.298853461 -0800] - ERR - NSMMReplicationPlugin - bind_and_check_pwp - agmt="cn=hub-<node name>" (<node name>:636) - Replication bind with SIMPLE auth failed: LDAP error -5 (Timed out) () [24/Dec/2019:07:55:39.323604233 -0800] - INFO - NSMMReplicationPlugin - bind_and_check_pwp - agmt="cn=hub-<node name>" (<node name>:636): Replication bind with SIMPLE auth resumed Thanks, Trev _______________________________________________ 389-users mailing list -- 389-users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to 389-users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/389-users@xxxxxxxxxxxxxxxxxxxxxxx