This article is interesting because it indicates that you need to create a packet filter to support a Protocol Rule. Interesting isn't quite the right term, though. In fact, it doesn't make sense. Tom www.isaserver.org/shinder http://support.microsoft.com/support/kb/articles/q277/8/12.ASP?LN=EN-US&; SD=gn&FR=0&qry=isa%20server&rnk=13&src=DHCS_MSPSS_gn_SRCH&SPR=ISAS <<Q277812 - How to Allow MSN Instant Messenger Traffic Through ISA Server.url>>