Hi, the error message is a little misleading as we don't run multiple masters. Actually the moved systems didn't have access to 4505/tcp and 4506/tcp of the Uyuni system due to the firewall setup. After adding the respective rules to the firewall, the error messages disappeared and system management works as usual. Regards, Tobias Crefeld. -----Ursprüngliche Nachricht----- Von: Crefeld, Tobias LKV Bayern e.V. Gesendet: Montag, 11. April 2022 10:45 we had to move several SLES15 systems to another network behind a firewall. Therefore we changed the respective files ifcfg-eth0, route and hosts and reloaded wicked. Access to repositories works fine but the service salt-minion shows: "Error while bringing up minion for multi-master. Is master at lkv-srvapp39.lkvbay.net responding?" (lkv-srvapp39 is the only Uyuni system)