Hi, Anyone having any issues with WinSSO and W2K8R2. The only authentication that is passed is NTLM. We have no issues on a W2K8 server. This is the error we see on the console. 2013-04-02 13:23:19.155 INFO - WinSSO: Kerberos: trying to authenticate session 2013-04-02 13:23:19.170 WARNING - WinSSO: Kerberos error: invalid token Negotiate TlRMTVNTUAADAAAAGAAYAIYAAAAYABgAngAAAAwADABYAAAADAAMAGQAAAAWABYAcAAAABAAEAC2AAAAFYKI4gYBsR0AAAAPIzTURNwk2DTSH9TP6TrmQUIARABDAEQARQBWAGcAZQBvAHIAZABhAFcAMAAwADAAVgBTAEQANQA0ADIAMAA41gbdaSTYxAAAAAAAAAAAAAAAAAAAAADA0oTaTyaniFl/p+Z/csw8TVXdrGBALA+DwNMNy16ro22HJ0D/I0nT (GSSHeader did not find the right tag), falling back to alternative authentication mechanism