When I go to federate the ArcGIS Server I get the following error message:
"Unable to federate at this time"
When I look into both the Portal and AGS logs I get the same error message:
"Failed to update the security configuration. Cannot update the security configuration as server is not registered with Portal".
When I set the AGS logs to DEBUG I get this message:
" Testing to see if this server has been registered with Portal as a federated server. Failed to test if the server is registered with Portal"
Then it states: "File or directory not found" in relation to http://www.w3.org/1999/xhtml and this of course cannot be accessed as it is a completely disconnected environment.
I have also checked the following at 10.3.1:
I was able to add store credentials of a secured ArcGIS Server service from the AGS I am trying to federate against so that proves that the certificates work as expected.
ROOTs and INTERMEDIATEs have been imported into the Portal Java keystore.
The main confusion stems from the fact it was federated earlier this morning, the URLs I used were similar to these (with the actual names removed for security reasons)
The correct PSA details were used in the username and password.