I've come across an issue that has forced me to (hopefully temporarily) uninstall the software which I was using to do some SNMP monitoring.
Using Thunderbird for email, Oauth2 (which effectively loads a browser window to authenticate) gets to the page where you click "allow" or "deny" and then goes to a "secure connection failed" page.
After a TB update I was able to determine the issue was that after clicking allow, the browser was attempting to load: (eg) https://localhost/?code=p6pqn9prup79mjffc2nbbg4wgmpdafet
(Edited some characters in the code in case they are identifying)
If I got to the url in normal firefox, I get
localhost uses an invalid security certificate.
The certificate is not trusted because it is self-signed.
Error code: MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT
The cert details point at the PRTG self signed cert
Has anyone any idea on how to resolve this, other than getting my own "proper" cert?