Cannot conect to stateless streamable http mcp server developed using C# SDK using VSCode mcp client #251978
Description
Developed and deployed a mcp server exposing majorly prompts and just one tool for testing and is getting the error :
2025-06-20 14:50:02.632 [info] Starting server from LocalProcess extension host
2025-06-20 14:50:02.663 [info] Connection state: Running
2025-06-20 14:50:03.942 [info] Discovered 0 tools
2025-06-20 14:50:04.775 [info] Connection state: Error ; will retry with new session ID
I have provided the options
.ConfigureServices((_, services) =>
{
services
.AddMcpServer(options =>
{
options.ServerInfo = new Implementation
{
Name = "Vite MCP Server",
Version = "1.0.0"
};
})
.WithHttpTransport(options =>
{
options.IdleTimeout = TimeSpan.FromMinutes(15);
options.MaxIdleSessionCount = 100;
options.Stateless = true;
})
.WithToolsFromAssembly()
.WithPromptsFromAssembly();
});
also in Startup.cs :
app.UseCors("CorsPolicy");
app.UseEndpoints(endpoints =>
{
endpoints.MapMcp("/mcp");
});
It works fine in local machine using http ports but not in https.
The hosted server also returns the error.
Could this be because of any certificate issue?
VSCode is my mcp client.