I recently was playing around with the localhost SSL certificate that is used with Kestrel when developing locally. After cleaning my certificate using dotnet dev-certs https –clean and then retrusting it through dotnet dev-certs https –trust, my browser kept telling me my certificate was expired. Adding more log to my application, it was telling me it was using a certificate with thumbnail X that I couldn’t find in my User Certificate Store. Low and behold, this happens, when you have a certificate (with the same name as your projet) lingering in the folder %APPDATA%\ASP.NET\Https. The certificates here is used in a container scenario. Thanks to this GitHub issue that pointed me in the right direction. Hope this little post can…