Vanilla and htacces + cloudflare = 404 error

Hi guys,

I enabled cloudflare with ssl for one of my personal site.

Here is the default vanilla htacces:

> # Original
> # If you modify this file then change the above line to: # Modified
> <IfModule mod_rewrite.c>
>    RewriteEngine On
>    # Certain hosts may require the following line.
>    # If vanilla is in a subfolder then you need to specify it after the /. 
>    # (ex. You put Vanilla in /forum so change the next line to: RewriteBase /forum)
>    # RewriteBase /
>    RewriteCond %{REQUEST_FILENAME} !-d
>    RewriteCond %{REQUEST_FILENAME} !-f
>    RewriteRule ^(.*)$ index.php\?p=$1 [QSA,L]
> </IfModule>

My main problem is many links are broken. 404 error. So how to fix it?

Forum is in the main directory

http://ift.tt/1dvHQ0Z