Hi David, Exchange RPC publishing depends on TCP 135 so blocking 139 wouldnt' have any adverse affect. HTH, Tom Thomas W Shinder www.isaserver.org/shinder ISA Server and Beyond: http://tinyurl.com/1jq1 Configuring ISA Server: http://tinyurl.com/1llp -----Original Message----- From: David V. Dellanno [mailto:ddellanno@xxxxxxxxxx] Sent: Friday, April 04, 2003 10:53 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: MS Windows Messager Spam http://www.ISAserver.org Thanks, I applied the blocking of 139 port inbound. I'll test the exchange today and send you the results. -----Original Message----- From: Quillman Shawn (RBNA/CIT1.1) * [mailto:Shawn.Quillman@xxxxxxxxxxxx] Sent: Friday, April 04, 2003 11:51 AM To: [ISAserver.org Discussion List] Subject: [isalist] RE: MS Windows Messager Spam Not sure. I didn't have any problems with exchange when I did it (it's on an SBS box), but then again I don't publish Exchange there. -Shawn ----- Shawn R. Quillman Robert Bosch Corporation RBNA/CIT1.1 38000 Hills Tech Drive Farmington Hills, MI 48331 (248) 553-1164 (P) (248) 848-2855 (F) shawn.quillman@xxxxxxxxxxxx