All subservers non-responsive

I have not changed or done anything to my virtualmin for a while. Recently today, out of nowhere… All my subserver domains are giving 500 internal server error. Usually I can figure these out myself but my main domain works just fine, all my sub’s do not. I do not even receive any errors while trying to load the pages.

Anyone have a guess why my subservers would give this error out of nowhere?

Nevermind. Was an IP resolving issue with mysql.