Set up your dashlet
If you enter an external URL in the custom URL dashlet and embed it as an iFrame, you’re guaranteed to get a content-blocked error message. But if you enter the address of the checkmk server itself, e.g. https://yourCMKserverIP, you will see the Apache-Server default site.
The workaround: Just create a HTML file in the document root of the Apache server with the following content, for example: nano /var/www/html/mycustomframe.html
Hello, I am trying to do it as you say and it does not let me giving an error and that I have configured both with iframe and reverse proxy has changed? if so could you provide me that data have changed. Best regards