WindowsXP with SP2 and Oracle Database

I have WindowsXP with SP2 and Oracle Database.

I am using that computer with Firewall on since couple of months and i am accessing database for my own purpose on clients are connecting to my computer.

Suddenly i need to allow one client to connect to my oracle database but trying to access the database after creating concern entry in tnsnames.ora still client not able to connect to database.

Then i realize after some efforts firewall is creating problem so i had switched off then try finally i get success but i want firewall should be on and also i want to allowed user to connect to my database for that i need to do below.

For normal oracle developer and client you need to do the following executables need to be added to the Windows Firewall exception list:

oracle.exe
tnslsnr.exe