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Unable to Run .NET Applications with HTTPS on macOS Due to Developer Certificate Issues

Kirill Filin
Updated

Problem

When attempting to run a .NET 8 application with HTTPS on a macOS 15+, the following error may occur:

There was an error creating the HTTPS developer certificate.

This error indicates that the default HTTPS developer certificate is either missing or expired. Additionally, attempts to regenerate and trust the certificate using dotnet will fail

Cause

This issue is caused by a known bug in the .NET 8: CertificateRequest.CreateSelfSigned fails on macOS Sequoia.

Resolution

To resolve this issue, follow the steps below:

  1. Update the .NET SDK to a version higher than .NET 8.0.10 (SDK version 8.0.403) and verify the installed SDK version by running dotnet --version

  2. Clean Up Existing Developer Certificates via dotnet dev-certs https --clean

  3. Run dotnet dev-certs https --trust to generate and trust a new developer certificate

  4. Test the application by running it with HTTPS enabled.

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