The token provider was unable to provide a security token

Question

I am configuring workflow for SharePoint 2013. For that I am creating a workflow farm and selected custom settings and selecting certificates from personal store. When I am select the option where it will auto generate the certificate configuration 
successful.
while selecting the certs from personal store, configuration failed to add host to workflow farm and throwing below error
Configuring Workflow Manager runtime settings.
The token provider was unable to provide a security token while accessing 'https://hostname:9355/WorkflowDefaultNamespace/$STS/Windows/'. Token provider returned message: 'The underlying connection was closed: Could not establish trust relationship for the
SSL/TLS secure channel.'.
Thanks,
Neetu
neetu

Answer 1

Hi,
When I am trying to receive the same messages from a Azure service bus subscription using .net (C#) client,
BusSubscriberbusSubscriber =
newBusSubscriber("TestTopic2",
"Endpoint=sb://overcasb.servicebus.windows.net/;SharedSecretIssuer=owner;SharedSecretValue=wqYlT4yHZimeUZacH+1V1hj/ZrKu7zK9ELaaLYDxqjc=",
"AssetMovement",
"AssetMovement");
I am getting the same error here also.
"The token provider was unable to provide a security token while accessing 'https://overcasb-sb.accesscontrol.windows.net/WRAPv0.9/'.
Error Code: 407 Proxy Authentication Required. The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied. (12209)
By setting  <defaultProxy useDefaultCredentials="true" /> in appconfig, I got rid of the above error. And now its working fine with .net(C#) client.
<configuration>
  <system.net>
    <defaultProxy useDefaultCredentials="true" />
  </system.net>
</configuration>
The same setting I tried in BTSNTSvc.exe config file and ofcourse restarted the host instance but still getting the same error. Any help?
gautam