Ah y'as du virtualhost c'est pour ça que ça ne marche pas.. il est pas dans le bon domaine le rewrite : suit ça:
Do you support .htaccess? What should I know about it ?
All our servers support .htaccess by default. Usage is unrestricted so you can put any rules or PHP flags to .htaccess file
But, there is one thing you should know about .htaccess and mod_rewrite rules:
We use virtual user home directory paths, so you may get errors when trying to set up search engine friendly URL's. All you need to do to fix this issue is add the below line to the very top of your .htaccess file:
RewriteBase /
Make sure this line is placed before all the other rules (on the first line of .htaccess file). That's it. Now your rewrite rules will be working fine.
Note: if you are installing your script to some directory such as www.yourdomain.com/forum/, you have to place RewriteBase /forum/ line to the .htaccess file which also must be located in public_html/forum/ directory.
En gros dans le premier htaccess tout en haut met
RewriteBase /
Positif