Kestrel Configuration Reload Certificate ArgumentNullException

[mhartmair-cubido]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

When having appsettings reload enabled and changing the Kestrel HTTPS certificate while the app is running an exception is thrown.

Expected Behavior

No exception is thrown.

Steps To Reproduce

Program.cs

WebApplication.CreateBuilder(args);
// this is enabled by default:
builder.Configuration.AddJsonFile("appsettings.json", true, reloadOnChange: true);

Change appsettings.json Kestrel.Certificates to another one while having the aplication running

"Kestrel": {
  "Certificates": {
    "Default": {
      "Subject": "www.contoso.com", //change to another one
      "Store": "My",
      "Location": "LocalMachine"
    }
  }
}

Exceptions (if any)

"Unable to reload configuration."
System.ArgumentNullException: Value cannot be null. (Parameter 'path2')
at System.ArgumentNullException.Throw(String paramName)
at System.IO.Path.Combine(String path1, String path2)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.CertificatePathWatcher.RemoveWatchUnsynchronized(CertificateConfig certificateConfig)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.CertificatePathWatcher.UpdateWatches(List1 certificateConfigsToRemove, List1 certificateConfigsToAdd)
at Microsoft.AspNetCore.Server.Kestrel.KestrelConfigurationLoader.Reload()
at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServerImpl.RebindAsync()

.NET Version

10.0.100-rc.2.25502.107

Anything else?

No response