How to access map service from ArcGIS server through JavaScript Application when Server is federated through Portal?

[ThomasPuthusserry]

I used to generate token using the URL below (to access the map service REST end points from a stand alone ArcGIS server) 

 https://myserver.com/arcgis/tokens / The JavaScript based applications uses these tokens to authenticate the map service.

Now I have installed latest ArcGIS Server Enterprise with Portal for ArcGIS where the server is federated through the portal. How can I authenticate to the server to access the map service REST end points under the current setup? What is the authentication / token URL?

Thanks Thomas

[RandallWilliams]

I think you're looking for this resource:

https://<somemachine.somedomain.com>/<portal web adaptor context>/sharing/rest/generateToken