gRPC server running as Windows Service works stand-alone not when running as service

Question

I created a basic gRPC Server using VS 2022 and want to run it as a Windows Service. The program runs fine in VS or Command line but when it's run as a service, it doesn't listen to the specified ports (6276). netstat doesn't show the port when it's a service but does otherwise. I'm running the service under an administrator account.

var options = new WebApplicationOptions
{
Args = args,
ContentRootPath = WindowsServiceHelpers.IsWindowsService() ? AppContext.BaseDirectory : default
};

var builder = WebApplication.CreateBuilder(options);

builder.Services.AddGrpc();

builder.Host
.UseWindowsService(options =>
{
options.ServiceName = "CADE eTutor Service Core";
});

builder.WebHost.UseKestrel(kestrel =>
{
kestrel.ConfigureHttpsDefaults(https =>
{
https.ServerCertificate = new X509Certificate2(@"D:\Data\CADE.core\LDNcert.pfx", "pw");
});
});

var app = builder.Build();

// Configure the HTTP request pipeline.
app.MapGrpcService<eTutorServiceMain>();
app.MapGet("/", () => "Communication with gRPC endpoints must be made through a gRPC client. To learn how to create a client, visit: https://go.microsoft.com/fwlink/?linkid=2086909");
app.Run();

launchsettings.json

{
"profiles": {
"eTutorService": {
"commandName": "Project",
"environmentVariables": {
"ASPNETCORE_ENVIRONMENT": "Development"
},
"applicationUrl": "https://srdev.learn.net:6276",
"dotnetRunMessages": true
}
}
}

What am I missing?

Answer 1

Hi there,

Try changing the default server port and see if that helps.

To change the grpc server port from the default (9090) to a different port you can do so using:

grpc.server.port=80

I hope this information helps. If you have any questions please let me know and I will be glad to help you out.

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Answer 2

As you can see, I set the port in launchsettings.json in the .Net Core server with "applicationUrl": "https://srdev.learn.net:6276". I changed the port from 6276 but it didn't make any difference. I think the default port for VS created grpc is 5001. I don't know how to set the port the way you've suggested. Where would I put grpc.server.port=6276?

Answer 3

Nobody has created a Windows Service using VS 2022 from a gRPC server template? I just need to know how you did it.

Answer 4

launch setting are only used by visual studio to start the app. app settings.json is used when standalone. be sure the app settings in the folder specified in sc.exe