We have problems as detailed in http://support.microsoft.com/?kbid=292018. The problem is fine if we allow external DNS resolution on the 1st ISA but this is not an acceptable resolution. The article mentions getting hold of a MS fix and that one should then have a W3proxy.exe version 3.0.1200.57 . However as I already have SP1 for ISA applied I have W3proxy version 3.0.1200.166. Does anyone know whether the fix I mention is supposed to be included in SP1 as the problem still seems to be there. Does anyone have the MS fix or know where I can get it.