VssBasicCredential with PAT not working on Windows Service

[LuigiMaestrelli]

I'm building a Windows Service project running .netcore3.1 that extracts some backlog items.
Running on VisualStudio (debug and release mode) works fine.

After deploying, and installing the service using SC CREATE I've got the message: "Microsoft.VisualStudio.Services.Common.VssUnauthorizedException: TF400813: The user 'MyDomain\MyComputer$' is not authorized to access this resource."

But I'm using the same PAT and the same URL.

Here is the code that I'm using:

var creds = new VssBasicCredential(string.Empty, "My PAT");
var collectionUrl = new Uri("The collection URL");
var connection = new VssConnection(collectionUrl, creds);
var witClient = await connection.GetClientAsync<WorkItemTrackingHttpClient>();

The exception is thrown when connection.GetClientAsync is called.

Any ideas on why it is working running on Visual Studio but not as a Windows Service?

Thanks

[lucasmartins098]

i am the same problem

[lucasmartins098]

Solved, now to work you need to insert this code before the connection:

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;