problem with 403 forbidden access to the site

problem is with http://www.congres-voyance.org (without the wordpress) some of my customers are forbidden to access as you will see from the snapshot i am the one trying to connect from her computer and no way to get it working. i have put a support ticket to the server hosting and they say:
"quote"
o if you’re getting a 403 forbidden that’s not network or the cPhulk but either htaccess or mod_security blocking the connections as per some rule that must be setup. Now I don’t see mod_Security setup so it must be a setting within wordpress or the htaccess file within that directory. Here’s a snippet of the logs for your IP:
"unquote"
i gave you the access
please help as i am desesperate it is a event coming up next week and a lot of customers are trying to make reservation
thks in advance
Jacques