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Exchange 2010 Connection dropped due to SocketError

We recently installed an Exchange 2010 Server and we are having some problems sending emails to certain domains.  One domain we are having problems with is nnwcpa.com.  Email is stuck in the queue with 4.2.2 Connection dropped due to SocketError.  

When I telnet to nnwcpa.com 25 from our email server it connects but as soon as a try and type any commands it disconnects.  It appears to be something with our email server because I can telnet to nnwcpa.com 25 from a different computer and it connects and I can issues commands without being disconnected.

I also noticed when I telnet to nnwcpa.com it connects to there email hosting service navi2.webnethost.net.  I tried telneting directly to navi2.webnethost.net from our email server and I was able to connect and issues commands but if I use the nnwcpa domain it disconnects me again.

Any ideas on what the problem could be?

I have disabled 2008 Server Firewall, Forefront Security and just about every advanced feature on the Broadcom nic but nothing has helped.

All the domains we have issues with are hosted on Exim email servers.
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1 Solution
rmarfilAuthor Commented:
It looks like it might be an issue with 2008 Server R2.  I have tried telneting from other 2008 Servers and I have the same problem.  As soon as a telnet to the remote email server and I try to issue a command I get disconnected.


telnet elandimage.com 25

220-titan.chicodev.com ESMTP Exim 4.69 #1 Wed, 14 Apr 2010 09:12:40 -0700
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.

Connection to host lost.

As you can see when I telnet to elandimage.com I am going to titan.chicodev.com.  If I telnet directly to titan.chicodev.com I do not get disconnected and I can issue commands.

telnet titan.chicodev.com 25

220-titan.chicodev.com ESMTP Exim 4.69 #1 Wed, 14 Apr 2010 09:19:00 -0700
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
EHLO glenncoe.org
250-titan.chicodev.com Hello soadmdc-ex.glenncoe.org []
250-SIZE 52428800
250 HELP
rmarfilAuthor Commented:
We got it to work, all the domains we were having issues with I pointed the domains directly to the email server via the hosts file.

Example:   elandimage.com

An mx lookup says elandimage.com is and when I telnet to it I connect to titan.chicodev.com which is  

Windows 2003 with Exchange 2007 I can telnet and send email to these domains with no issues.  All of our 2008 R2 Servers on the other hand cannot.  The 2008 R2 Servers only work when I point the domains directly to there hosting services email servers IP.
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