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


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. 


  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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