.NET Dev Certificate Trust on Linux

When to Use This Skill

Use this skill when:

• Redis TLS connections fail with UntrustedRoot or RemoteCertificateNameMismatch in Aspire
• dotnet dev-certs https --check --trust returns exit code 7
• HTTPS localhost connections fail with certificate validation errors
• After running dotnet dev-certs https --clean and needing to restore trust
• Setting up a new Linux dev machine for .NET HTTPS development
• Aspire dashboard or inter-service gRPC calls fail with TLS errors
• Upgrading from Aspire < 13.1.0 (which didn't use TLS on Redis by default)

The Problem

On Windows and macOS, dotnet dev-certs https --trust handles everything automatically — it generates the certificate, installs it in the user store, and adds it to the system trust store. On Linux, it does almost nothing useful. The command generates the cert and places it in the user store, but: