Getting an error on server

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The tech at my webhost suggests an issue with Concrete5:

"The errors appear to be caused by something in the index.php code. The engineer who investigated this issue suggests investigating your CMS (Concrete5), as the error is likely being caused by incorrect folder permissions, a lack of an .htaccess file for URL rewriting or a recently installed or removed addon. a lack of an .htaccess file for URL rewriting"

Site worked fine last week altho very slow.
The only addon is the Automatic Email Obfuscator.
What should the .htaccess file say and what permissions should be set for C5?

Edit: I can login to the backend and open the sitemap. But navigating to any page brings up a 503 error.

trixiemay
 
ob7dev replied on at Permalink Reply
ob7dev
.htaccess should be what is output from the dashboard URL redirection page settings if URL rewriting is enabled.

The root index.php file is very plain:
<?php
require 'concrete/dispatcher.php';

I'm thinking of starting a concrete5 hosting company once I have more experience with XenServer.