Hi Zoltan, You need to change the default gateway. Remember the clients needs to be a SecureNAT client. You might play with Q311777 and see if that helps you. HTH, Tom Thomas W Shinder www.isaserver.org/shinder http://tinyurl.com/1jq1 http://tinyurl.com/1llp -----Original Message----- From: Zoltan Szaraz [mailto:szaraz@xxxxxxxxxxx] Sent: Sunday, November 17, 2002 5:13 PM To: [ISAserver.org Discussion List] Subject: [isalist] exchange server publishing ERROR hello, our company changing our internet provider, and I need to configure our mail server to 2 different IP adress (old IP adress and the new) . I install on different server an ISA server, and every user use this new server for web browsing. on the new server I configure the Server publishing wizard for mail server ( the external IP from ISA server with port SMTP is replicated to the MS Exchange server on the LAN). If I from the internet (different IP adress) connect with "telnet IPold 25" then the exchange server reply correctly: "220 ms.local.sk Microsoft ESMTP MAIL Service, Version: 5.0.2195.5329 ready at Sun, 17 Nov 2002 23:57:22 +0100 221 2.0.0 ms.local.sk Service closing transmission channel Connection to host lost." It's OK. If I connect to the new server IP ardress: "telnet IPnew 25" then I get blank screen. after 15 seconds I get a message: "Connection to host lost." PLEASE can somebody explain me, where is a problem? Two ISA server can publish only one MS Exchange2000 server?? zoltan szaraz