phpBB 2.0.21 problem

[monky91]

I have installed a phpBB 2 but after that, I can never log in, why?

Is there any file I need to chmod to 777 beside config.php and /cache directory?

Thanks

 

[lambada]

For official phpBB support go to the phpBB supoort forums: http://www.phpbb.com/phpBB

Are you sure you're using the right password? Try resetting your password.

 

[monky91]

Yes, I am sure, and if I type incorrect password it will tell me invalid, but when I try real password, I will still be a guest.