[TYPO3] Unable to Clear FE Cache

Michael Baker mbaker at pobox.com
Fri Jul 6 01:45:48 CEST 2007

I wrote:
> I'm using Typo3 3.8.1 and I'm unable to clear the front end cache.  
> Everytime I try I get the message:
>       Precondition Failed
>     The precondition on the request for the URL /typo3/tce_db.php
>     evaluated to false.
>     ------------------------------------------------------------------------
>     Apache/1.3.33 Server at www.frickers.co.uk Port 80
> ...  What do I need to do to clear the cache?
I've discovered that this is an Apache error message.  The Apache error 
log contained the following:

[Thu Jul  5 15:59:41 2007] [error] [client] mod_security: 
Access denied with code 412. Pattern match 
"\\\\.php\\\\?.*=(https?|ftp)\\\\:/.*(cmd|command)=" at REQUEST_URI 
[severity "EMERGENCY"] [hostname "www.frickers.co.uk"] [uri 
[unique_id "Ro0HXVBScZUAAIEC69A"]

In a message to this list dated 10/03/2006, with subject Re: [TYPO3] 
error when clearing FE cache, Christoph Koehler 
<christoph.koehler at gmail.com> wrote:

> I guess this is caused by mod_security. ... Adding
> SecFilterEngine off
> to my .htaccess file did the trick. Maybe someone more knowledgable can  
> take a look at this and figure out why it is happening.

Which is what I've done, and it has worked.  However I have no idea why 
or how this works.


Dr Michael Baker  +61 8 8121 8343  www.michael-baker.com

websites; ecommerce; databases;
software selection, customisation and installation

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