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I was doing some changes to the server (writing an Transport Agent). After trying to install it, I started to get some errors.

Now, when connecting to the SMTP server the session hangs just after finishing the DATA section. I'm not sure what happened, I disabled my transport agent and uninstalled it, then restarted the server. The problem persists.

In the Event Viewer, four of the same errors show up:

Source: FSCTransportScanner Category: Scan Error Event ID: 5021 Description: Unable to retrieve internet monitor interface.

What could have happened?

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1 Answer 1

Do you happen to have Forefront installed on that server? There is a KB article here that describes this problem, and a solution, it may be worth trying the solution even if you don't have Forefront.

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