Internal 500 Error -- problem with .htaccess

I have all 404 errors to redirect to my main page (which is http://www.alanwake.net/) but when I try to attempt to access an incorrect page on a subdomain, like so:

http://adm.alanwake.net/this/is/a/fake/directory

It's turns out to be a 500 error. I think what is trying to happen is that the .htaccess file is trying to redirect to the main page from that subdomain, but it has a problem and thus results in the 500 error.

vBSEO is installed in the root.

This is my .htaccess file:

Code:

# Comment the following line (add '#' at the beginning)
# to disable mod_rewrite functions.
# Please note: you still need to disable the hack in
# the vBSEO control panel to stop url rewrites.
RewriteEngine On

# Some servers require the Rewritebase directive to be
# enabled (remove '#' at the beginning to activate)
# Please note: when enabled, you must include the path
# to your root vB folder (i.e. RewriteBase /forums)
RewriteBase /
RewriteRule ^forum/(.*)$ $1 [L,R=301]
RewriteCond %{REQUEST_FILENAME} !admincp/
RewriteCond %{REQUEST_FILENAME} !modcp/
RewriteRule ^(.*\.php)$ vbseo.php?vbseourl=$1&%{QUERY_STRING} [L]

RewriteRule ^(archive/.*)$ vbseo.php?vbseourl=$1&%{QUERY_STRING} [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)$ vbseo.php?vbseourl=$1&%{QUERY_STRING} [L]

Hi,

the rewrite rules in .htaccess affect URLs that reside below forum URL *only*. Subdomain pages (like adm..) are not processed because they point to another folder usually.
As you may see, the correct urls in this subdomain don't work either: http://adm.alanwake.net/

Is there anyway to get it ignore those subdomains?

You should probably configure your webserver to pass all subdomain links to a main domain to do that. Check your server config for "adm" subdomain. (vBSEO is not related to processing urls other than located under your forum root, where .htaccess is located).

Ahh ok I'll send my host an email now.

Isn't there anything I can do though in the .htaccess file?

I remember last time I had something similar (a simple 404 redirect) that I had change the .htaccess file to have http://www.alanwake.net/ as the url to redirect to and it worked.

Oh and http://hosting.alanwake.net/ seems to work okay.. but not the 404 error on that.

http://hosting.alanwake.net/fake/folder/

Other domains documents reside in other folders, so any changes in forums .htaccess do no affect those domains at all.
You may create their own .htaccess files if you'd like tough