One of most difficult things to find (imho) is information about API and Service URL’s for just about any and all applications. Microsoft is better than some (Dell, I am looking at you…) but it can still require some metaphorical google search back flips to get to the right information.

That said… I wanted to quickly document the right mix of URL’s that must be allowed in order for Windows OS license activation to work:

If those are blocked for some reason on your network, license activation will fail. I am not sure if all of them are needed for every edition of windows. Server 2012 R2 might required, for example, only a subset of that list vs. Windows 8 or 10 which might require all of them or a different subset.


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