Please refer to:
I am seeing many of these debug error log
amAuthUtils:01/11/2010 05:23:31:892 PM GMT-08:00: Thread[http-8080-3,5,main]
ERROR: AuthUtils:getAuthContext(): Invalid Session Timed out
This is not an error condition. having this log with million of users
for large deployment is going to flood the debug file.
Please correct it.
This problem also occurs on OpenAM 10.0.1.