C# ssl debug

The .NET Framework 4.8 does not have a direct built-in equivalent to Java's -Djavax.net.debug=ssl:handshake for enabling SSL/TLS handshake debugging from the command line or via a simple configuration switch. However, you can achieve similar diagnostic output using the following approaches: 1. Enable System.Net Tracing (Recommended for .NET Framework) You can configure System.Net tracing via your application's app.config or web.config file to log detailed information about network activity, including SSL/TLS handshakes. Example app.config: xml 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ⌄ ⌄ ⌄ ⌄ ⌄ ⌄ ⌄ ⌄ ⌄ This logs System.Net and System.Net.Sockets activity to a file (network.log). While it doesn’t dump raw TLS handshake bytes like Java, it does show certificate validation, cipher suites negotiation (indirectly), and connection errors. For more TLS-specific diagnostics, combine this with Windows-level tools (see below). ⚠️ Note: Tracing impacts performance—use only for debugging. 2. Use Windows Schannel Logging (OS-Level SSL Debugging) .NET Framework uses the Windows Schannel (Secure Channel) security package for TLS. You can enable Schannel event logging via the Windows Event Log: Open Event Viewer → Applications and Services Logs → Microsoft → Windows → Schannel. Right-click Operational → Enable Log. Reproduce your SSL issue; handshake errors and details will appear here.