Web console no access after renew certificate under Mozilla Firefox

Web console no access after renew certificate under Mozilla Firefox

Hello everyone,  

I'm currently having a problem with web access after creating a new self-signed certificate for the Patch Manager Plus web frontend.
To renew the expired certificate, I need to restart the service or server.
I've done this.
Now I can no longer access the web console via Firefox.
Does anyone have any advice?
It seems to still work perfectly in Edge or Chrome, but not in Firefox, which is my preferred browser.
Unfortunately, a Google search didn't provide me with a decent solution.
Perhaps someone here in the forum has a solution for me to solve the certificate problem for Firefox. 
The exact error message in Firefox is: SEC_ERROR_INADEQUATE_CERT_TYPE  

Thanks in advance and best regards, 
Tobi

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