[ccnet-user] ccnet 1.5 release login problem

[Edwin]

I think it maybe cause by session timeout exception.
it throws asp.net exception if I do not use it for a while but if I
login again,it works fine.
it throws exceptions if I use mail link to ccnet when I did not login
before.
Culd I redirect to login page if my session timeout or I had not
login?
thanks