MyBB Community Forums

Cookies only work on "www.myforum.net", they don't work on "myforum.net".
-Is it possible to make cookies work on both "www.myforum.net" and "myforum.net"?
-Is it possible to force users to use "www.myforum.net"? Example: If a user goes to "myforum.net", they are redirected to "www.myforum.net".

http://community.mybb.com/thread-74904.html

Just set the cookie domain to .myforum.net

You'll need to use a .htaccess redirect to redirect them.