Having the following message while trying to setup a DNS cluster with cPanel?
Unknown API Error when attempting to contact the remote system
This error is usually caused by firewall blocked port (most likely tcp-2087) and/or DNS record pointing to the wrong IP.
To find out, have a look at the following log file :
You should be able to see an entry similar as the one below :
Could not connect to https://0.0.0.0:2087/json-api/version?: Could not connect to ‘0.0.0.0:2087’: Connection refused