what is the firewall exception for folder sharing?

Hey

I have 2 computers, winXPpro (sp2 installed) machine and win2k3 machine at

home. Configured in a network, they share the same internet connection, via

a router

I've shared a folder on the win2k3 machine, but from the winXP machine I'm

having trouble connect to this folder. Both machines are using Windows

Firewall. I can connect if I turn off Windows Firewall.

So what exceptions to I need to implement in Windows Firewall on both

machines so that folder sharing and other Active Directory services works

without problems?

Jeff