I'm trying to connect to an Oracle DB. The Cleint is behind one firewall, and the server is behind another firewall. Both the client and server are on the internet. I'm tring to use TCP/IP and SQL/NET8. The tnsnames file is using port 1521. I can't TNSPING the server. Is this because port 1521 is being blocked? Is port 1521 commonly blocked? What is the correct way to accomplish this?