KLC: Unable to Authorize Endpoint Connection When Using a Proxy

Problem: The following error pops up when attempting to KLC to managed machines:

Unable to authorize endpoint connection

Additional Info: Without an authorized endpoint connection, all sessions will be treated as 'offline' Connected With Error - ChannelServer Offline

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Cause: A Proxy could be in place, and applications are not set up to redirect to the Proxy and could be hitting the firewall directly. 

Resolution/Workaround:

  1. From an affected machine, log in as an Administrator.
  2. Click Start > Run.
  3. Type cmd and click OK.
  4. In the Command Prompt window, type the following based on the operating system installed on your computer:

netsh winhttp set proxy

Example: netsh winhttp set proxy adslcache.rmplc.co.uk:8080

  1. Hit enter and close out cmd. 

Reference: #314712 - https://social.technet.microsoft.com/Forums/windows/en-US/e6cbb051-78c8-4338-93eb-ae0f1ec326c7/force-all-apps-to-use-ie-proxy-settings 

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