Firstly, I'm access http://domain.com (without the www) and login using user1 account.
After that, I'm access http://www.domain.com (with www), this process looks that I wasn't logged in. here I use user2 to login again and succeed.
in other times, i change back the addesses to http://domain.com again, and it's look that user1 is still logged in. I changed again to http://www.domain.com (with www) and it's look that user2 is still logged in.
http://domain.com for user1
http://www.domain.com for user2
How to fix it? I want http://domain.com and http://www.domain.com will be logged using the same account (one account)...