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We are facing a strange issue here. Everytime a user connects via RDP client to one of our terminal server, the server itself tries to establish a connection via 1433/tcp to the client (and even 80/tcp sometimes).

Any ideas what could explain that?

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Does netstat -b tell you which process on the server is trying to make the outbound connection to the client? – Chris McKeown Sep 16 '13 at 7:33
Are you saying that the server is initiating a new connection to the client or are you saying that the client initiated connection is initiated from port 1433 or port 80 on the client? – joeqwerty Sep 16 '13 at 14:55

You might have a custom port defined on the client like here 1433 is MSSQL default port .Please go with netstat -b over to the server and if it is possible on the client side also (as some remote desktop programs can be forced to try a different remote port )

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