Photo by Georg Bommeli on Unsplash

After playing around with ASP.NET developer certificates on macOS I couldn't get it back to work. Whenever the app started, I got this exception on startup:

Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found or is out of date.

Whatever I tried (dotnet dev-certs https [ --clean / --trust ]), I couldn't get it to work.

I also removed the certs manually from macOS Keychain.

After a while I noticed, that in ~/.aspnet/dev-certs/https even after a dotnet dev-certs https --clean there has still been one .pfx left, owned by root.

After deleting this one, ASP.NET picked up a fresh generated developer certifcate correctly again.