connection resets

We are getting reports of numerous connection errors being reported of the form:
2009-10-08 12:43:28,312 ERROR ository.service.internal.RdbRepositoryDataMediator - InternalRepositoryException processing query
com.ibm.team.repository.common.InternalRepositoryException: CRJAZ0368I Error executing query
stmt = select t1.ITEM_ID, t1.STATE_ID from REPOSITORY.LICENSE_TYPE t1
at com.ibm.team.repository.service.internal.dataaccess.FetchRows.execute(FetchRows.java:233) .....

Caused by:
com.ibm.db2.jcc.b.tn: A communication error occurred during operations on the connection's underlying socket, socket input stream,
or socket output stream. Error location: T4Agent.sendRequest(). Message: Connection reset by peer: socket write error. ERRORCODE=-4499, SQLSTATE=08001 ....


Caused by:
java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:105)
at java.net.SocketOutputStream.write(SocketOutputStream.java:149) ....


We are running Jazz 2.0.0.1 with DB2 9.5.4 on a separate server. We have not tweaked any of parameters away from the default values. The period before getting the timeouts appears to be around the 2hr mark. Any advise as to where such a session timeout can be set, either on the Jazz server or DB2 server.
We currently run the live service running against an Oracle instance, hosted on the same server but never encountered this issue before. We but planning to migrate the live instance to this jazz / DB2 server setup

TIA
Mike