1. A misconfigured Proxy/Firewall can cause this problem. Double-check the Proxy/Firewall settings.
Add the following urls to the exception list within your Firewall/Proxy:
http://*.update.microsoft.com
https://*.update.microsoft.com
http://download.windowsupdate.com
For help configuring Proxy/Firewall refer to documentation or contact the manufacturer.
For more information on this issue and alternate resolution please click on the Microsoft Knowledge Base link below.
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