session time

After a short time, I must re-login because the server forgets my role

I see there on communityserver.org users will not disconnected. What must i do
for this?

my cookie settings:

Roles Cookie Enabled   Yes 
Track Anonymous Users   Yes 
Roles Cookie Name  CSRSIRoles 
Roles Cookie Expiration  80 
Anonymous Cookie Name   CSRSIAnonymous 
Anonymous Cookie Expiration  20 
Cookie Domain    localhost 
Anonymous User Online Window   30 

Must i set session state settings on IIs also?

Andres,

97% of the time frequent logouts are due to a missing MachineKey in your site
web.config.  This is not included in CS by default.

Here are a number of CS Bits on the topic.

Regards,
Dave

Thank you very much Dave! 

After creating of maschine-key on web.config  (CS 2007.1 installation root)
logout/login it runs like communityserver.org