Additional Reading

Reading Request Broker Logs Associated with Unicode Problems

If you are debugging a unicode connection, you can expect to see this in the request broker log - note the serveropts field:

...
14:08:11 using mapping: db2:*:*:*:*:*:*
14:08:11 using [generic_db2] ServerProgram=db2_mv
14:08:11 connect params: domain=DB2 db=sample serveropts=W readonly=0
...

The Unicode parameters that are supplied to the server options cannot be displayed properly in the broker log so the above will be seen; this is normal behaviour.