Well if you're able to telnet on the local net and get a response your MSX server is receiving, when you try to telnet to it from an external (public) IP address you said you get no response, try putting your PC on the external side of your firewall (connect directly via crossover cable possibly) giving it an IP address that is on the appropriate subnet, then try telneting to the firewall's external address on port 25 and see what you get. If that isn't possible you can also change your firewall IP address to be on a different Private IP address (10.0.0.1/24) put a machine on the new private network (10.0.0.2/24) and see if you can access the MSX server by telneting to the firewall's new address (telnet 10.0.0.1 25) and see if you get a proper response. Your firewall would be your problem if you are still unable to access. I know nothing about your firewall system, but..does it perform only NAT translation or is it setup to perform SMTP proxy functions as well. If it is a SMTP proxy service, you should check that as well. You should probably check with your ISP to see if they are blocking SMTP services at some point as well before you spend to much time trying to find out what's wrong with your configuration. -----Original Message----- From: Morriz [mailto:mauri.fox@xxxxxxxxxx] Sent: Thursday, November 14, 2002 3:32 AM To: [ExchangeList] Subject: [exchangelist] SMTP 25 http://www.MSExchange.org/ Hi joe! And thanks for all the effort to try to help me. I can start with my router/firewall, that is an linux router software called freesco(www.freesco.org) that i have set up because it was simple to run and dont needed hardisk or cd-rom.I have configured to portforward to my webbserver thats in on an DMZ and mailserver that is on the same network. Both have private ip adress configured, my webserver works fine, but not my e-mail server(exchange) My internet connection is a user class of service. I think that you may be right on that the provider are blocking inbound on their network.But if this is the case, can i bypass this problem some how without spending a lot of money? Or is it impossible? Wen i do the local teleneting on my local ip 192.168.x.x on port 25 i get this response: 220 ns02.domain.com (ISP Domain) Microsoft ESMTP MAIL Service, Version: 5.0.2195.2966 ready at Fri, 15 Nov 2002 00:25:07 +0100 Is this ok? Sow where do you think the problem might be? Hope you got some more info to go on... Thanks! /Morriz ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: exchlist@xxxxxxxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')