Slow DNS modifications from dnsadmin

Question

Why are the DNS pages on my cPanel or WHM interface responding slowly?

Answer

DNS Zones will load slowly in the cPanel or WHM interface when there is a connection issue with the remote DNS cluster, causing a timeout with dnsadmin. 

You will want to review the dnsadmin log for "Connection Timed Out" entries when a DNS cluster member is offline. Once the DNS server is identified, you will need to diagnose the connection issue to resolve the dnsadmin timeout. To fix the issue temporarily, please disable the offline member until the connection issue has been identified and resolved.

Here are a few examples you can use to help diagnose this:

grep "Connection Timed Out" /usr/local/cpanel/logs/dnsadmin_log

nc -w2 -4 -v <IP> 2087

Note: Make sure to replace "<IP>" with the address of the server you are trying to reach.

Additional Resources:

The cPanel log files 

How to troubleshoot network issues

What causes the DNS Cluster error: "Disabled due to connection failures?"