A port provides a location for an application to interface with the network. If there is no application that is listening at a particular point, data sent there will never be used.

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Cannot Delete Unwanted COM ports - Windows 7

I recently installed a Cannon wireless printer for temporary use, the drivers of which set nearly all my COM ports to be constantly in-use (an occasionnal bug noted in the ReadMe after installation ...
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Windows 7 is blocking ports

I am trying to open port 80 and 3690 for HTTP and svnserve respectively (inbound for both). I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. ...