403 error page with link tool and mod_security
In some hosting providers the Apache (or other, nginx) "mod_security" detect when a GET pass an url in the query parameters and in this case a 403 error page is sended to the user.
When you create a new link to google.com and want to click it in the list, the "real" link is :
The content of "link_url" is the issue. To avoid this, we can encode the url in base64 for example (base64_encode()) in main/inc/lib/link.lib.php and decode (base64_decode()) in /main/link/link_goto.php_ but should perhaps rethink the logic ... ?