Active Check displays "Wrong" Data

Hi I am using CheckMK 2.0.0p23 on Debian 11. I have active checks for my live sites which monitor
if they receive correct data from the webserver and another check which shows the expiration date of the SSL Certificate.
The Site in question is contergan-infoportal.de When I use curl on the command line I get lots of data and when I use Chrome I see the site as it should be. But just for this site I get a strange error. Normally this should indicate that the Typo3-Backend is not working but I can assure you, it is.
HTTP CRITICAL - Invalid HTTP response received from host on port 443: HTTP/1.1 500 Internal Server Error
Why do I get this error and how can I fix this?

Yours sincerely
Stefan

Hello Stefan,

Without knowing the configuration of your check it not possible to say a lot.
In case of “Check HTTP Service” I would recommend to go to CLI and run the plugin with debug options.
You find the check_http in ~/lib/nagios/plugins.

regards

Michael

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