Server 2003, SP2 – WinXP (Virtural)

hello,

I created two virutal machines one running server2003SP2 and 1 winXP SP3. I ran DC promo on the sever created a admin account and configured the account in a group that can add PC’s to the domain.

The only time i can add a pc to the domain is when the firewall is off on both PC’s

What configuation am i missing on the firewall that will allow this.

thanks in advance.