You may receive a cPanel & WHM update failure notification with the following:
The cPanel & WHM update process failed for the following reason:
Maintenance ended; however, it did not exit cleanly (256). The following events were logged: /scripts/check_unreliable_resolvers. Review the update logs to determine why the update failed.
This notification is sent when the script
/scripts/check_unreliable_resolvers found that some, or all, of the configured resolvers are not reachable from your server. You can find the resolvers configured on your server in
/etc/resolv.conf or WHM >> Resolver Configuration.
To find which resolver is unreachable, you can run the following script:
(Note: the output has been truncated for visibility)
⚠ Partial DNS resolver failure
Once you have found which resolvers are unreachable, you can temporarily disable them by adding a '#' to the front of each unreachable resolver line in
Optionally, you can use WHM >> Resolver Configuration to remove the unreachable resolvers, or to add new resolvers that are reachable from your server. If all resolvers are failing, you can temporarily use Google's public DNS resolvers 188.8.131.52 and 184.108.40.206.
Our documentation on Resolver Configuration can be found here.