"503 Service Unavailable" while connecting to Grid Control

Hi all,

I am having problems with getting Oracle Enterprise Grid Control up and running.
It was working fine since October till December 5th. On Friday, one of the mount points ran out of space because of rapidly growing trace files in the OH. I didn't notice it on Friday and just left it over the week-end. Yesterday when I navigated to the OEM link i got the following:

*503 Service Unavailable**Service is not initialized correctly. Verify that the repository connection information provided is correct.*

I went to the server, cleaned the trace files (they actually contained nothing interesting or related to the existing problem) and tried the link - didn't work.
I bounced the DB - no results.
I checked the OMS_HOME/sysman/log/emoms.log & emoms.trc files - they both contain the following errors:

<.........>

2008-12-09 12:15:16,676 [AJPRequestHandler-ApplicationServerThread-11] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:22,011 [AJPRequestHandler-ApplicationServerThread-6] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:24,885 [AJPRequestHandler-ApplicationServerThread-5] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:31,174 [AJPRequestHandler-ApplicationServerThread-11] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:35,735 [AJPRequestHandler-ApplicationServerThread-7] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:37,530 [AJPRequestHandler-ApplicationServerThread-8] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:38,935 [AJPRequestHandler-ApplicationServerThread-12] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:41,887 [AJPRequestHandler-ApplicationServerThread-7] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:44,098 [AJPRequestHandler-ApplicationServerThread-8] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones 2008-12-09 12:15:45,309 [AJPRequestHandler-ApplicationServerThread-11] ERROR conn.ConnectionService verifyRepositoryEx.878 - Invalid Connection Pool. ERROR = User credentials doesn't match the existing ones

I checked the SYSMAN credentials - it works. I checked listener - everything is OK.
I bounced the server - no results.
I went to Google and MetaLink - just one artikle in both places (posted by the same person, I believe) with the same error, but no answers for his question..
Have anybody seen this trouble? How did you guys handle it? I don't wanna rebuild the whole thing, I believe there should be more elegant way to fix it.

I would aprecciate your help and thoughts. Thank you in advance,
M.

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