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Error Message: System.ServiceModel.Security.SecurityNegotiationException: Could not establish a secure channel for SSL/TLS with

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I received the following Error message: “System.ServiceModel.Security.SecurityNegotiationException: Could not establish a secure channel for SSL/TLS with authority 'xxx'. ---> System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel.” 

The root cause of the problem is an untrusted certificate. Look at the certificate path for the web service by opening the UUX console in a browser and using the browser tools to look at the certificate path. You may need to install one or more intermediate certificates onto the computer calling the UUX. In the browser you may see "Certificate errors" with an option to "Install Certificate" when you investigate further - this could be the certificate you missing.

In some rare cases, the browser (e.g. Chrome) does not show any error with the certificate but the Worker service still cannot be started due to SSL problem. It usually happens when the SSL certificate has been updated on the Web Server and the previous version of the SSL certificate is a Worker Host machine. To clean up the certificate cache use:

  1. Open "Internet Options" from the Control Panel.
  2. Run "Clear SSL state" from the "Content" tab

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