Symptoms
- During any DNS record change or addition in Plesk the page times out, however, the change is applied.
- The following error message is output to
/var/log/plesk/panel.log
with the debug mode enabled:Error code 1: rndc: connect failed: 203.0.113.2#953: timed out
Cause
Connection to one of the slave DNS servers is not possible:
# nmap 203.0.113.2 -p953
...
Host is up (0.0087s latency).
PORT STATE SERVICE
953/tcp filtered rndc
Nmap done: 1 IP address (1 host up) scanned in 0.65 seconds
Resolution
Make sure that connection is possible from the slave server side by opening TCP port 953.