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Cant Send Email From Microsoft Exchange Through Untangle

Posted on 2009-04-06
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Last Modified: 2013-11-16
We can receive email but we cant send email when we try and go through our untangle box (6.0.2). If we bypass it (physically) there isnt any problem. In Policy Manager we have retained the no rack policy for port 25. The setup is DSL modem/router -- switch -- untangle external NIC -- untangle set as bridge -- untangle internal NIC -- switch -- Exchange Server/SBS Small Business Server and all clients.
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Question by:lriess
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Expert Comment

by:Suraj
ID: 24079906
do you get any NDR? What is it?
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Author Comment

by:lriess
ID: 24080009
Yes: "The remote server did not respond to a connection attempt."
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Author Comment

by:lriess
ID: 24098344
The problem still has not been resolved. Does anyone have any recommendations? I am willing to award all the points I have available (first-time questioner).
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Accepted Solution

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lriess earned 0 total points
ID: 24116231
Found the solution by paying a local IT guru to figure it out. Our Exchange server had a static IP address which mandates designating the default gateway. Before the firewall was put in the loop, the gateway was the DSL modem, but now that the firewall is between the Exchange server and the modem you have to make the untangle server the default gateway.

For those who are unsure of how to do this in Windows, go to Network Connections, right click on the Local Area Connection you're using and select Properties. Make sure you're on the General tab and double click on Internet Protocol (TCP/IP). Alternately you can make sure the Internet Protocol (TCP/IP) is highlighted and then click the Properties button. If you're using a static IP address then Use the following IP address radio button is already selected. For the Default gateway enter the IP address of the computer you have untangle installed on. Click the OK button for that dialog box and then the OK button for the Local Area Connection Properties dialog box and you should be good to go.
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