I ran into an issue with my recently deployed ISA firewall. It was blocking
any STMP incoming traffic. This made it so my Exchange users could send
email just fine but could not receive any incoming email. I checked the
Event Viewer and saw this:
Event Type: Warning
Event Source: Microsoft Firewall
Event Category: None
Event ID: 14090
The server publishing rule Exchange POP3 SMTP Server, which maps
192.168.5.32:25:TCP to 188.8.131.52:25 for the protocol SMTP Server, was
unable to bind a socket for the server. The server publishing rule cannot
To resolve this I had to make a simple change to my Exchange SMTP rule in ISA. First go into the ISA management console. Find your SMTP rule for incoming traffic. Right click on it.
Select properties. Then go to the “To” tab. Be sure to select “Requests appear to come from the ISA Server computer”
Click ok and then apply the changes to ISA. This should fix the issue and you will not see the warning in event viewer anymore.