Ok in other parts of the network i don't have any problem with doing file xfers via netbios (with nt4.0) over a PIX using NAT with a global (dynamic nat). But on this one pix (same code rev) I can only have one file xfer per src ip. So i nat everyone to 1 address and this is what i see. Host A starts xfer to Server 1 Host B starts Xfer to Server 1 host A session gets reset (tcp reset) and it dies host C startx xfer to server 1 host B session get reset ... etc etc etc etc. Just to see if this was a PIX problem i stopped doing NAT for 3 hosts on the PIX, and started doing it on a router just before the PIX. Same thing. Also note, that if i don't nat 3 hosts so there src ip stays the same, then i don't have any problems. We also setup a NT4.0 workstation, and put it in the same place as the W2k servers, and didn't have any problems. .. .. .. ??? so i'm thinking its an MS issue, but i would like to see if anyone else has seen this. BTW if anyone knows, how would i debug file xfers on W2k? i don't have any info from the server. __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ - [To unsubscribe, send mail to [EMAIL PROTECTED] with "unsubscribe firewalls" in the body of the message.]