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SBS Exchange 2003 external port 25 failing

Posted on 2004-09-10
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Last Modified: 2012-06-21
Internally (from the server itself) if I telnet to port 25 I get the normal response giving me the name of the server etc.

Externally I get what looks like a success full connection, except, it is blank, and as soon as I hit any key I am disconnected.

I have the same rules on the DLink Router/Modem to allow port 80 in from anywhere and port 3389 from anywhere

I can establish a remote desktop connection to the server without any problem.

But cannot bring up the Exchange OWA or a SMTP session.

this is regardless of weather I use DNS resolution or IP address, so DNS resolutuion is not part of the problem.

Any Ideas boys and girls?

Raybans
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Question by:Raybans
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by:BNettles73
ID: 12032012
Have you checked your MX record? Double check your firewall rule to make sure 25 is allowed inbound and outbound from the outside ... What version of Exchange are you running? Make sure you relay restrictions on the SMTP virtual server are configured properly.

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by:Raybans
ID: 12032107
Outbound works fine.

as stated above, Exchange 2003 as part of SBS 2003

examples of log entries

Event Type:      Warning
Event Source:      MSExchangeTransport
Event Category:      SMTP Protocol
Event ID:      7002
Date:            9/11/2004
Time:            10:41:54 AM
User:            N/A
Computer:      TELSYDD01
Description:
This is an SMTP protocol warning log for virtual server ID 1, connection #1. The remote host "210.9.128.40", responded to the SMTP command "rcpt" with "450 Client host rejected: cannot find your hostname, [220.245.67.79]  ". The full command sent was "RCPT TO:<sam@sifcom.com.au>  ".  This may cause the connection to fail.

For more information, click http://www.microsoft.com/contentredirect.asp.


btw, port 25 outbound works fine, I can send email and telnet to other mail servers on port 25

when I telnet to the server from outside I get a terminal session, with no text

and it disconects at the first key stroke?
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by:Vahik
ID: 12032462
do u have authentication enabled  for ur inbound connection?make sure only annonymous is checked.
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Expert Comment

by:f_umar
ID: 12033477
in smtp virtual server properties on delivery tab then advanced there is a check box to perform reverse DNS lookup on incoming messages which might be cause of this problem.

This message was not delivered because the headers indicate that it is coming from an email service other than the one indicated by the IP address. It is a common practice of Spammers to forge message headers in this manner, therefore this type of message will not be delivered.
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by:f_umar
ID: 12033482
also check that your smtp virtual server is configured to listen on all unassigned ip addresses on default port.
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by:Raybans
ID: 12093339
ok will get this question closed soon

replaced the ADSL Modem/router and it all works.

modem faulty was brand new, so back to the manufacturor for that one
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