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Exchange server 2003 lost connectivity on port 25

Posted on 2006-07-19
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Last Modified: 2010-03-06
Suddenly around noon today my Exchange Server stopped delivering incoming messages.  All internal emails work fine.

I am not getting a response from my exchange server when I try to telnet to port 25.

All services are running on exchange.

The information store is mounted.

The firewall is not in question when I try to telnet from the same subnet.

Help!!
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Question by:LamkaB
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9 Comments
 
LVL 27

Expert Comment

by:Exchange_Admin
ID: 17143004
Is your SMTP service running on the Exchange server?
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Author Comment

by:LamkaB
ID: 17143058
Yes, the SMTP service is running along with all the exchange services.
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LVL 27

Expert Comment

by:Exchange_Admin
ID: 17143375
Are you sure that there is not a firewall running on the server?
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Author Comment

by:LamkaB
ID: 17143384
Double checked.  Firewall service is not loaded.

Brenda
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Author Comment

by:LamkaB
ID: 17143412
when running netstat -na on the exchange server the following entries exist:

Proto               Local Address               Foreign Address             State
TCP                 0.0.0.0:25                      0.0.0.0                        LISTENING
TCP                 192.168.1.248:25            192.168.1.1:52825       TIME_WAIT
TCP                 192.168.1.248:25            192.168.1.1:52833       TIME_WAIT
TCP                 192.168.1.248:25            192.168.1.1:52869       TIME_WAIT
TCP                 192.168.1.248:25            192.168.1.1:52874       TIME_WAIT

There are other entries for port 25 all showing TIME_WAIT
as well as other ports.

Brenda
0
 

Author Comment

by:LamkaB
ID: 17143744
Found the problem.  

I added an ip of 2 servers to the list of machines under connection control. One of which was the Firewall and the source of the incomming mail.

However, Exchange apparently did not like it!
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LVL 104

Expert Comment

by:Sembee
ID: 17149563
If you restricted the SMTP connection then I would expect traffic to stop.
Email that is coming from outside is not coming from the firewall - it simply passes through the firewall. Unless your email is coming in from an external machine (for example an antispam provider) then you cannot restrict access to SMTP if you want email to come in correctly.

Simon.
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