If your website is showing the following error message after checkout you must consult your hosting company.

Not Acceptable

An appropriate representation of the requested resource /cgi-bin/os000001.pl could not be found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
The error is caused by a server security module called Mod_Security. An example solution could be the following however is it highly recommended that you seek the help and advise of your hosting company to find a preferred solution, SellerDeck can not be held responsible if you choose to use this solution.

Backup your .htaccess file if you have one in the 'webroot' directory, this is commonly known as 'http' or 'htdocs' folder.Then make a ‘.htaccess’ file with the following content and upload it to your 'webroot' directory.

<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off