Unable to login with www. prefix

[carchapter]

Whenever I try to logon via http://www.abc.com/coppermine/, I am always unable to logon. It will always bring me back to the main index page. Only when i logon via http://abc.com/coppermine, it will be sucessful. Any ideas?

[Nibbler]

Post a real link and test user account.

[carchapter]

http://www.carchapter.com/coppermine/

[removed - Nibbler]

In addition, I am unable to switch from admin mode to user mode.

The problem of being unable to logon happens on and off. Any idea of resolving both issues?

[Nibbler]

Don't post an admin account on a public forum or you'll have problems 1000 times worse.

Logging in and out and switching user to admin mode all works fine for me, so it must be a problem with your browser/firewall. Try clearing your cookies, using a different browser, disabling the firewall.