troubleshooting Question

No 220 response to telnet on port 25 from certain servers, works fine from others

Avatar of brislane
brislaneFlag for Ireland asked on
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Hi there,

I'm trying to remotely troubleshoot a problem with an Exchange server (2003) receiving email.

From some machines, telnet to the server works fine, as below:

~ > telnet mail1.server.com 25
Trying 1.2.3.4...
Connected to mail1.server.com.
Escape character is '^]'.
220 mail1.server.local Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at  Fri, 11 Apr 2008 14:47:25 +0100

From other servers, it connects, but doesn't respond with the 220, unless some data is sent (pressing enter, or sending a HELO command) - obviously a server isn't going to do this autommatically.

~ > telnet mail1.server.com 25
Trying 1.2.3.4...
Connected to mail1.server.com.
Escape character is '^]'.
------- just sits here -------
------- if you press enter you get the 220 response -------
220 mail1.server.local Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 ready at  Fri, 11 Apr 2008 14:57:32 +0100

Anyone have any ideas?
ASKER CERTIFIED SOLUTION
dlongan
President

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