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.
rmarfilAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.

Example:

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.
E

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 [137.164.168.10]
250-SIZE 52428800
250-XXXXXXXXXX
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
0
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:

208.43.208.234   elandimage.com

An mx lookup says elandimage.com is 74.86.34.208 and when I telnet to it I connect to titan.chicodev.com which is 208.43.208.234.  

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.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.