Problem  :

When moving Joomla-sites from an old server to Multisys Network Web Hosting Server, the search engine friendly urls didn’t work anymore.

The main problem was that the layout was disappeared for all sites other than the main site.

Reason :

Multisys Network have enforced security which will affect on SEF Url.

Solution:

The issue was solved by entering a value for the variable in the configuration.php:

to your site URL