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Please advise which ports/destinations shall be opened at the Linux firewall to allow MS Essentials updates for Windows PCs.

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up vote 1 down vote accepted

Problem was with the way MSE works with proxy. To my surprise, it does not simply takes proxy settings from IE, but requires magic command (for Windows 7):

netsh winhttp import proxy ie

Details here.

Even though my proxy was set in transparent mode and above command reports that direct connection is used.

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