Our test server (based on windows 2008) crashed because of a power loss during the weekend.
After the restart, all services started successfully but Oracle 11.2 didn't.
I tried to start all services manually and it seems to be all right (I can log on SQL*Plus from Powershell)
But when we try to connect with Oracle SQL developer we got this
I tried Googling the error code but I can't figure out what the problem is (I'm just a developer and I don't know much about system administration).