The problem exists when using the folowing driver in Websphere V6 datasource:
"DB2 Legacy CLI-based JDBC Driver XA DataSource" using the class:

I have two Databases. One is local in our network and which is running in a WinXP OS. Above said driver is working fine while I am trying to connect.

Another Database is in OS/390, which I am accessing through network tunnel. While trying to connect that only I am getting abouv said error.

Both databases I am able to connect through DB2 Commandline(DB2CMD).