I have IIS Express running a .Net Core web application.
Chrome is able to browse the HTTPS version fine, and until recently so was Firefox. Suddenly I'm getting this error:
Secure Connection Failed
An error occurred during a connection to localhost:44358. Certificate key usage inadequate for attempted operation. Error code: SEC_ERROR_INADEQUATE_KEY_USAGE
And unlike the error for a self-signed certificate, there is no way for me to accept the certificate or "Continue Anyway".
I have tried:
- Regenerating Firefox's certificate store (deleting cert9.db and cert8.db)
- Repairing IISExpress.exe
- Uninstalling and re-installing IISExpress.exe
- Updating Visual Studio (2019)