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SMTP connections refused

Posted on 2008-10-27
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Last Modified: 2013-11-30
I am trying to change one of my customers over to a new hosted spam filtering service, but they are unable to connect to the Exchange Server (Small Business Server 2003). Initially I thought it was the settings in the Firebox, but I have verified that the proxy rules allow traffic from any IP address on the external interface to the internal IP address of the SBS.

They are able to receive email still from their current hosted spam service.

I tested the SMTP connection using telnet on port 25 both externally and internally and get the same results. I have tested both Internet available FQDN for the server as well as IP address and localhost. From my Mac it goes about 3 seconds and then reports:

Connection closed by foreign host

From a Windows XP box in my office I get a blank command prompt Window which stays that way indefinitely until I press a key and then it immediately returns to the command prompt.

I have even tried the following on the SBS:

telnet localhost 25

without success. I looked in the Exchange System Manager under Message Delivery and don't see any restrictions there.

What else am I missing? Somewhere the servers for the old spam service are allowed and nothing else is.
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Question by:jhalscott
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by:mrwalker15
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You need to go to Exchange System Manager and select the server you are troubleshooting.
Drill down to protocols > SMTP > SMTP Virtual server.
Right-click and select Properties.
On the Access tab and make sure the connection, relay, and authentication options are granting access to the new server.
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jhalscott earned 0 total points
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This appears to be some issue caused by one of the security updated in October. The Windows Firewall even though disabled behaves as if it is running and it locks down everything after a reboot. I had to stop RRAS and start the Windows Firewall service to add exceptions and then shut it down again to get traffic flowing back in.
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