Hello to all, maybe a problem already solved, but I've noticed an incredible behaviour of ISA. Sniffing the traffic from ISA interfaces, I've found that it makes a NetBT subnet broadcast in order to resolve IP address for any URL(FQDN) requested by proxy clients! The same behaviour with any ISA machine's interface, any installation mode, any hotfix or SP applied (ISA member server, configured 1st and 2nd WINS and DNS servers addresses, redirecting requests to an upstream server). I've first disabled NetBIOS over TCP/IP, then only set ISA host as a P-node resolver. Tanks in advance for any reply. Andrea Valsania System administrator Aitek S.p.A. c/o Elsag S.p.A. Via Puccini, 2 - Genova Sestri P. - IT e-mail: andrea.valsania@xxxxxxxx