Some customers are reporitng issues with SSO Login this morning. This seems to be limited to certain machines\browsers. We are continuing investigations
We have identified a possible cause (Origin Header for some requests being NULL) which could account for the issue. We are working on a patch ASAP. This issue appears to be effecting only a small percentage of machines at any given site and some of those effected have managed to overcome the issue by clearing cookies or a Ctrl+F5 refresh.
WE will provide an update at 10AM on the Patch status if not before.