So are you testing from outside the lan or inside? what are the differences between the clients that work and the ones that dont? - virus software - nat clients, firewall clients Greg ----- Original Message ----- From: ISA To: isalist@xxxxxxxxxxxxx Sent: Friday, January 19, 2007 8:46 AM Subject: [isalist] SMTP Connection Closed Hope someone can help! I think this is an ISA 2004 (patched) issue. From some clients I can send/receive email just fine (and telnet port 25). But from other clients I can not. I monitored the ISA logs and observed the connection initiated then being closed. From Exchange 2003 box I shut of IMF and GFI services - still not luck receiving email or telnet'ing from a particular client. Any ideas would be greatly appreciated. Respectfully Joseph Danielsen, MCSA-Messaging, MCP Network Blade Inc. 49 Marcy Street Somerset, NJ 0887 732-213-0600