pcnoic

Hello, I have a configured subdomain on my main domain at http://blog.studentmanifesto.to . Since yesterday every time I try to visit I get an error 500. I have checked the server's settings from my side at least and I could not find any misconfigurations. I saw a post in this forum that was suggesting to change the database address from localhost to 127.0.0.1, but it was recommended for Johnny. What should I do ? Thanks in advance.