McpClientFactory.CreateAsync connecting to the Microsoft learn mcp server just hangs

[kkfrosty]

Describe the bug
Described in the title.

To Reproduce
Steps to reproduce the behavior:

1. Code below using sse using the Microsoft learn mcp server was working and now the code just hangs, trying to configure a timeout doesn't seem to change anything.

Expected behavior
It was working last week and you'd get a response from the learn server. The issue is even if the mcp server is having issues, this shouldn't just cause an application hang.

"https://learn.microsoft.com/api/mcp

Additional context
Add any other context about the problem here.
` IMcpClient client;

// Step 4: Create appropriate transport client
if (transport.Equals("sse", StringComparison.OrdinalIgnoreCase))
{
    this.ReportProgress($"🌐 Setting up SSE transport for {serverName}", "MCP-Provider");
    
    var endpoint = section["Endpoint"] ?? throw new InvalidOperationException($"Endpoint required for '{serverName}'");
    this.ReportProgress($"📡 Connecting to endpoint: {endpoint}", "MCP-Provider");

    var sse = new SseClientTransport(new SseClientTransportOptions
    {
        Endpoint = new Uri(endpoint),
        TransportMode = HttpTransportMode.AutoDetect,
        Name = serverName
    });

    McpClientOptions options = new()
    {
        // You can set additional options here if needed
        InitializationTimeout = TimeSpan.FromSeconds(30)
    };

    this.ReportProgress($"🔗 Creating MCP client connection...", "MCP-Provider");
    client = await McpClientFactory.CreateAsync(sse, options, null, new CancellationToken()); < - This line of code hangs, the call is made and never returns and hangs if you run it.  It was working last week and the source could be the Microsoft Learn MCP server, but whatever is going on, can't cause this call to just hang and never time out.
    this.ReportProgress($"✅ SSE client connected successfully", "MCP-Provider");
}`

[TianqiZhang]

@kkfrosty Learn MCP server does not support sse transport, could you try again using http and see what happens?

[PederHP]

You should generally always try streaming http in your client and only fall back to sse if it's not supported. SSE is a deprecated transport, but many AI coding tools still incorrectly use it, so it might show up in your config despite the server not actually being an old SSE server.

[kkfrosty]

That was from the sample code at the time and it worked, so something changed, but since upgrading to the latest bits and updating the deprecated pieces, it is working, I would considered this closed