Webadmin bug, auto disconnect after few seconds

I am trying to connect to webadmin using domain:8091
after I login with administrator account and password, it gives me few seconds to use the webadmin and then it kick me out.
and in chrome conaolse I see this messages:
Failed to load resource: net::ERR_EMPTY_RESPONSE
GET http://domain:8091/pools/default?uuid=(some string…)&waitChange=20000&_=1405596217605 401 (Unauthorized)

I opened all ports on the server, and it does allow me to login and do stuff, bet then just kick me out.
I installed the latest version for centos 6.2