Can u see the "Administration Menu" after you actually login? And if so, can u see "System Admin" Icon after clicking on "Administration Menu"?

Don't know if my problem is the same as stealth's.
After I login from the 1st page, there will be another login screen on the right. After I login again on the right, there is a menu on the left including "Administration Menu".

When I click "Administration Menu", it gives screen with the message "This is your first time to enter the administration section. Press the button below to proceed." When I click <Submit>, another screen saying "Logging you in" appears for a few second and then it returns to the screen "This is your first time to enter the administration section" again. It is endless loop.

I can't find any solution yet. Someone said it is related to firewall but I tried to disable all firewall but same problem exists.

I'm now going to trace the code from what I saw on screen. I'm pleased to share with anybody with same problem after I found the solution.