Since we moved our site to Windows server 2008, EPiServers built in error handler seems to have stopped working. When an error occur all that is shown is for example 500 Internal error or 404 page not found but these seems to come from the IIS instead of EPiServer. Sometimes I get "The custom error module does not support this error".
I'm sure this is some configuration issue but can't really find what. Anyone who be of assistance?