My, what a helpful post that was, mart2001, ;-)Surender, this happened to me after a while and when I dug deeper I found a bunch of services and subsystems were failing. I traced it to my SQL server "forgetting" which port it was running on. Once I fixed that it all came up again.
I had same issue, mine was related to common services not running because DB connection issues. check out this log for errors: /Interwoven/ApplicationContainer/server/default/log/server.log and jboss.log