1. "Stealth mode" is not available if you publish a service or use a packet filter. In order to receive traffic, the 3-way TCP handshake must occur. This can't happen if ISA (or the published server) fails to respond to a TCP-SYN request. Granted, UDP operates a bit differently ("find your way, little packet!"). ISA only responds on an IP/port combination that is specifically open. What publishing rules do you have in place? Jim Harrison MCP(2K), A+, Network+, PCG ----- Original Message ----- From: "Tom Soulsby" <tom@xxxxxxxxxxxxx> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx> Sent: Tuesday, September 11, 2001 08:57 Subject: [isalist] Operating in Stealth Mode http://www.ISAserver.org When I scan my external IP I see some of my ports (i.e. 21) operating in stealth mode but 25 and 80 are marked as open. Can ISA operate in stealth mode and what steps do you need to take to achieve it ? Thanks, Tom. ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')