These might help:
http://www-01.ibm.com/support/docvie...id=swg21305110

http://www-01.ibm.com/support/docvie...id=swg21280212
http://www-01.ibm.com/support/docvie...swg21287143(In case you have SSL enabled)

If these do not solve, could you please upload the Systemout.log for review

The postings on this site are my own and do not necessarily represent the positions, strategies, or opinions of IBM