When trying to add a domain - "Error: The API request failed with the following error: 504 - Gateway Timeout."

Symptoms

When trying to add a domain in cPanel, an error occurs similar to the following:

CONFIG_TEXT: Error: The API request failed with the following error: 504 - Gateway Timeout."

Cause

When DNS Cluster members are unreachable, this causes the domain creation attempt to timeout.

Resolution

Test the connection to each DNS Cluster member that is associated with the server. 

1. Log in to the command-line using SSH as the root user, or using the Terminal in WHM.

2. Perform a connection test any your remote DNS Cluster members. For example:

   # time curl -skI https://203.0.113.2:2087/

   Note: Replace 203.0.113.2 with the IP of your remote server. The output of the time command will indicate if this connection took a long time to complete.

Any servers that are unreachable should be reviewed to ensure they are online and in good health. If the DNS Cluster server is no longer in use, then the server should be disabled.

Delete a server from a DNS cluster