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Windows 10

Proxy Requirements for Windows Update in a Windows 10 Environment

As more companies are rolling out Windows 10 in the environment, there have been an increased number of reports of Windows 10 clients trying to retrieve information from across the Internet despite being managed by WSUS or SCCM. Microsoft has taken time to explain what the situation might be, but many may have missed a KB article from July 2016 that detailed changes in how Windows 10 clients treat proxy requests – particularly HTTP RANGE requests.

According to KB3175743:

Windows Update uses WinHttp with Partial Range requests (RFC 7233) to download updates and applications from Windows Update servers or on-premises WSUS servers. Therefore, proxy servers configured on the network must support HTTP RANGE requests. You may choose to apply a rule to permit HTTP RANGE requests for the following URLs:
*.download.windowsupdate.com
*.au.windowsupdate.com
*.tlu.dl.delivery.mp.microsoft.com
If you cannot permit RANGE requests, you can configure a Group Policy or MDM Policy setting that will bypass Delivery Optimization and use BITS instead.

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