Originally posted by ggnanaraj
The client is microstation (CAD application) on Windows NT workstation connecting to an Oracle 8.0.3 database. All other systems connect OK, but this one system.

I have checked...

1. ping - no request timed out
2. tnsping - no problem
3. client trace - nothing amiss in these trace files

Any other ideas to solve this issue?

BTW, sqlplus from this problem client connects without any problem to the database.

Thanks.
Just check the location of file containing connect strings (equavalent to tnsnames.ora for sqlplus connections) and change the location to someother folder and check the connection speed.. It may help you.