501 error

[harmhofstede]

Script URL: http://www.schoolhelpdesk.nl/destrandwa ... p?submit=1
Version of script: 5.2.0
Hosting company: Protagonist.nl
URL of phpinfo.php:
URL of session_test.php:
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When sending a new ticket I get this error:

Not Implemented

The page you are looking for cannot be displayed because a header value in the request does not match certain configuration settings on the Web server.
Web Server at schoolhelpdesk.nl

I don't know what this means?

Best regards,

Harm Hofstede

[harmhofstede]

Solved by changing something in modsecurity by hostingprovider.