Multi-Network is not working

I am Using WordPress 3.8.1 over multisite/multi-network Platform, I have main network
Main Network: drjslab.org/wp-admin/network ?Working
Sub Network: scott.drjslab.org/wp-admin/network ? notWorking
All sub site working perfectly but sub-network site like scott.drjslab.org/wp-admin/network is not working, sometimes its show error for 505 Page Missing or some time “time out” Error.
My .htaccess file is like this

Action application/x-hg-php53 /cgi-sys/php53
AddHandler application/x-hg-php53 .phpp53 .php 

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]

Can anyone help me to solve problem?