Univention Bugzilla – Bug 48316
Reverse DNS entry of Master not available after installation of Samba AD DC
Last modified: 2023-06-08 13:39:43 CEST
During a workshop today: We installed: 1. UCS Master 4.3-3 2. UCS@school 4.3 v6 3. Samba AD DC on UCS Master After the switch of the DNS backend for bind9, the PTR record for the IP address of the Master did not resolve to the hostname/FQDN. Instead, bind9 returned "NXDOMAIN". The A record was fine, though. We recognized this only, because during the system setup of the first UCS@school Slave a pre-join DNS check tested if the IP address is resolvable. Unfortunately the error message is a bit misleading: "No UCS DC Master could be found at the address." That's true, but a hint that the PTR lookup went wrong would be great. I spent quite some time investigating the A record und SRV records (_domaincontroller_master._tcp) first. In our case, we were not able to join the slave until the underlying issue was resolved. In the end, a simple restart of bind9 on the Master resolved the issue.
We need logs here: connector-s4.log, setup.log, updater.log, join.log
This issue has been filed against UCS 4.3. UCS 4.3 is out of maintenance and UCS components may have vastly changed in later releases. Thus, this issue is now being closed. If this issue still occurs in newer UCS versions, please use "Clone this bug" or reopen this issue. In this case please provide detailed information on how this issue is affecting you.