Hi everybody! I have a strange problem! Domain controllers - 2 Win2k servers, workstations Win98, Win2k and XP. Everything works fine until I install the firewall client. After that, things go crazy. Some computers cannot contact the DHCP server, some cannot join the domain or acces network resources. Ping to outside does not work, nslookup does not work, browser works. The happy case is when only the net time does not work. Not ALL the computers show this symptoms, only few, but the number grows slowly in time. If I remove the client works fine but in some cases it didn't work so I reinstalled 3 computers. The DHCP and DNS are not on the ISA machine!! We checked DHCP and DNS config and it is fine. Any help is welcomed. Thanks! Vic