Hi All, Today I ran in the mentioned problem "Unable to access the authentication service" while adding a secured AGS from my internal AGS (10.2.2) server not using SSL. This AGS is using token based authentication. Worked fine with Chrome 39.0.2171.95 and Firefox 34.0.5 but NOT in IE 11. After reading this and several other posts I realized it could not be CORS related. After puzzling for several hours I found what was causing this problem with IE 11.
It turned out I had added my web servers FQDN in the 'local Intranet' 'advanced' 'sites' option of IE.
After removing this entry from the local intranet websites list it DID work fine in IE as well!.Putting this entry back broke IE again.
Sander ten Arve