Implemented a new Oracle client server which must pass through a firewall to connect to the Oracle9i database. We had the listener port 1521 opened in the firewall between the systems and that appears to be working. We can successfully tnsping from the client system to the database system, but any attempt to use SQLPLUS results in a TNS timeout. I've double-checked the tnsnames.ora and it uses only port 1521. Any ideas?