Instead of doing masking or forwarding (causes unneeded headaches & problems galore) in your Host Control panel the much simpler solution is just to create an .htaccess redirect rule in BPS Custom Code. Since this is a Network/Multisite site the Primary site is the site where you will be creating this redirect rule/code below.
For a Network/Multisite Subdirectory site where you still want to be able to login to the Dashboard of subsite “boh” and want to redirect the front end of the “boh” subsite to another site this is the code modification you would make to the WP Rewrite Loop Start code.
1. Copy this code below to this BPS Root Custom Code text box: CUSTOM CODE WP REWRITE LOOP START: Add www to non-www/non-www to www code here
2. Click the Save Root Custom Code button.
3. Go to the BPS Security Modes page and click the Root Folder BulletProof Mode Activate button.
Just as an example: This is the standard WP Rewrite Loop Start htaccess code
# WP REWRITE LOOP START
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
This is the custom code after modifying the WP Rewrite Loop Start code
# WP REWRITE LOOP START
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !^(/wp-admin|.*wp-login\.php.*|.*boh/wp-admin|.*boh.*wp-login\.php.*) [NC]
RewriteCond %{REQUEST_URI} ^.*boh/ [NC]
RewriteRule (.*) http://www.businessofhonor.org/ [R=301,L]
RewriteRule ^index\.php$ - [L]
To Redirect a Single standard WordPress site instead of Network/Multisite
http://forum.ait-pro.com/forums/topic/301-redirect-and-old-wordpress-dashboard/#post-12531