Can't post message with "How-To:"

One of the URL's is this one: http://www.macwiki.nl/wiki/How-To:Adres … uteplanner
It's just one of a lot of the wiki pages that have How-To: in the URL.

Yes i can:

Sometimes i put a message on the forum that i moderate with a link to a How-To: wiki. If i cut and paste it straight into a post or in a link with url= tags the message won't post.

An appropriate representation of the requested resource /post.php could not be found on this server.

is the message i got when i try with only a link.

I tried a little further and discovered that only

How-To:

is causing the same problem. So it has to do with it.

The version of PunBB we use is 1.2.16, maybe not the latest but we'll deal with it because there are plugins installed.

We could not reveal the bug you indicated.
Could you please inform us what Mods are installed on your forum.

Try consulting the hosting provider: describe the problem and provide the text of the error.
If your hosting provider can't solve this problem, try doing the following:

Create or edit a text file named .htaccess for your main forum directory and add the following code:

<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>

Quote:
ModSecurityTM is an open source intrusion detection and prevention engine for web applications (or a web application firewall). Operating as an Apache Web server module or standalone, the purpose of ModSecurity is to increase web application security, protecting web applications from known and unknown attacks.