I read your article "Configuring ISA Server Interface Settings". Thank you man, I set my WINS server address in the WINS tab of TCP/IP settings of my NIC. of course my ISA is in PDC and aslo DNS and WINS server too. but today I see everythings work except ftp in workstations and ping in win98 workstations. ping can resolve name but couldn't return result. I did all your advice for SecureNAT clients. how can I solve this one? thank you very much for your time and friendship.