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

Question

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

Answer

If you see that a server in your DNS Cluster was disabled because of the error "Disabled due to connection failures," this means that your server failed to communicate with the remote server on port 2087.

To troubleshoot this, please ensure your server is whitelisted in the firewall of the remote server. You may also need to check if any outbound connections to the remote server are being filtered on your current server's firewall.