There are a few things that are recommended to try if you’re having trouble accessing your server including; checking the Contabo Server Status page here to see if there are any wider issues at Contabo, restarting the server via the Customer Control Panel, connecting to your server via VNC, using the “Can’t reach server” form which can be found here and watching our video about how to get your server back online here.
You can find the more details on what to do if your server is down in the article here.