I have an Oracle 8i instance installed on WinXP Pro. All is working properly, but when I turned on the WinXP firewall I couldn't connect to the database. I setted up the name of the service, the name of the service host (in this case this is "localhost") and the default port of Oracle 1521 as external port number. The system setted up the very same port number as the internal port number. But the problem is still persist.
How could I use the built-in WinXP firewall and Oracle to be continue working?