ServU- 2.5 with XP - cannot ping !

[Jupiter2k]

newbei here

I just setup ServU-2.5 on WInXP

zonealarm as firewall and XP in house firewall !

using port 27015 and has tried other ports

My friend can't even ping my FTP server

Yes I have set incoming and out going UDP/TCP in zonealarm to port 27015 etc

Question Is winXP firewall stuff the server
How can I set it ?

Thanks

P/S :I have tried the server on LAN on WinMe (dual boot) .. no problem !