Wordpress 403 Error

We are having an issue with our domain www.4tdoor.com.  We can't login to the Wordpress website and we can't view the website on the domain name.  It is giving a Forbidden "You don't have permission to access / on this server. Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request."  

I noticed that the website is being blacklisted by barracuda.  I'm wondering if this could be a reason for the error?
Zion PhilPresidentAsked:
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btanExec ConsultantCommented:
typically this is due to index.php permission which most has done by overwriting it with new php.
http://www.wpwordpress.com/how-to-solve-403-forbidden-error-in-wordpress/
OR editing the .htaccess
https://wordpress.org/support/topic/403-forbidden-error-cant-access-website-or-login#post-7425139

as for the blacklisted, unless you have the browser showing any error or you are going through any proxy into the web internet, doubt the blacklist is reason behind esp you have never been able to reach your own domain site.

But if it is the other way round, meaning able to access domain till recent period then probably the "blacklisting" effect may need to further investigate - esp with even browser setting this to trusted site in option...may also want to try internally without going into internet to see if can access the domain or go for direct ip address via browser
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