Hi there,

I'm trying to set up a subdomain like sub.domain.com that points to a folder different than the default public_html/sub folder. In my case, I'm trying to point to public_html/sandbox/sub.

In my .htaccess file I have:
RewriteCond %{HTTP_HOST} sub.domain.com
RewriteCond %{REQUEST_URI} !sandbox/
RewriteRule ^(.*)$ sandbox/$1

When I try to visit sub.domain.com I get a 404 error saying The requested URL /home/user/public_html/sandbox/sub/ was not found on this server. even though that folder exists. Admittedly, I'm new to writing .htaccess stuff so I'm sure I'm doing something wrong, but I have no idea what. Any help would be greatly appreciated!

This is public_html/.htaccess, and not public_html/sub/.htaccess, right? You're still in the root (public_html/) directory when this is executed, so $1 contains sub/ and it's trying to redirect to public_html/sandbox/sub/. Move this redirect into public_html/sub/.htaccess and drop the first RewriteCond, and you should be sent to public_html/sub/sandbox/ (http://sub.domain.com/sandbox/). If you want to be sent elsewhere, give a full http://.... for the RewriteRule.

LP's internal DNS is going to send sub.domain.com to www.domain.com/sub, so you can't avoid starting from there. Maybe you could ask them to put a custom entry in DNS, but they'll probably turn you down.