Disable Enable SSL encryption for the PRTG website

by

Stop the PRTG Core Service. Then, change the below registry key to 0

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Paessler\PRTG Network Monitor\Server\Webserver\showsslnagscreen

Restart the PRTG Core service

https://kb.paessler.com/en/topic/79959-disable-enable-ssl-encryption-for-the-prtg-website