www.subdomain.domain.com works on my site (how can i redirect it to non www)

i have my forums at http://forums.domain.com/

I did a 301 redirect for http://www.domain.com/forums/ to the above url ^

I just tried typing in www.forums.domain.com just to see if it would work (it doesnt work on dp) and it worked... How can I stop this and make it so that the www version of the sudomain redirects to http://forums.domain.com/ ?

 

Goto your domain control panel and create a cname alias
"www.forums" pointing to "forums.domain.com" without quotes of course.

 

Thanks Guttu, but the below code seemed to do the trick for me.

I put this in my .htaccess in my /forums directory to remove the www in www.forums.domain.com just in case anyone decides to type in that address, or link to it like that.

RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.(.+)$
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

Code (markup):

 

That'll work too