Trying to a download file from TLS 1.3 site only - TLS error

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.NET6.0

Hey guys, I'm trying to download a file from a website that only supports TLS 1.3 using HttpClient, but it keeps giving me this error:

System.Security.Authentication.AuthenticationException: Authentication failed because the remote party sent a TLS alert: 'ProtocolVersion' ---> System.ComponentModel.Win32Exception (0x80090326): The message received was unexpected or badly formatted.``

Here's the file url: https://ksk-h7glm2.xyz/dl/ac95c389-31ae-416f-a8cd-fdfb5969d528.cbz

I already tried adding tls13 to the Security protocols but to no avail. What's interesting is that I'm able to use python and its requests library to download the file just fine; does windows 10 22h2 not support tls1.3? I tried adding a registry edit to "client" in the protocols for 1.3, but that doesn't do anything either. I would appreciate any help

What I have tried:

I already tried adding tls13 to the Security protocols but to no avail.

Posted 11-Apr-23 12:48pm

u1923u12389h

Updated 11-Apr-23 13:21pm

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Graeme_Grant 11-Apr-23 19:03pm

Please post your code so that we can see what you are doing.

u1923u12389h 11-Apr-23 19:12pm

Yeah, it's a simple HttpClient making a post request:
using (var client = new HttpClient()) {
var resp = await client.PostAsync("https://ksk-h7glm2.xyz/dl/ac95c389-31ae-416f-a8cd-fdfb5969d528.cbz");
}

I'm thinking the issue is Window's SSL library has a cipher suite that is unavailable because python's requests library works fine with openssl

Graeme_Grant 11-Apr-23 19:20pm

Download = get, not post.

u1923u12389h 11-Apr-23 20:07pm

Yeah, in this case, it requires a post. On the site, doing a get request would redirect it back to the homepage. I tested the url with python and it needs a post. The odd thing is it works with the requests library, not with what .net uses.

Graeme_Grant 11-Apr-23 20:08pm

The code below downloads the file with no issues. Hence why I posted it. 39,860KB, right?

u1923u12389h 11-Apr-23 20:10pm

Seriously? What os are you using? Still gives me the same problems, that's strange

Graeme_Grant 11-Apr-23 20:12pm

The issue is at your end, not the code.

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Graeme_Grant · Answer 1 · 2023-04-11T13:21:00

Here is an example of how to download a file. I am using a console app.

C#

using Microsoft.Extensions.DependencyInjection;

const string HttpClientKey = "CodeProjectHelp";

IHttpClientFactory? _httpClientFactory;
string url = "https://ksk-h7glm2.xyz/dl/ac95c389-31ae-416f-a8cd-fdfb5969d528.cbz";

CreateHttpClient();

using HttpClient client = _httpClientFactory!.CreateClient(HttpClientKey);
await using FileStream fileStream = File.Create("ac95c389-31ae-416f-a8cd-fdfb5969d528.cbz");
await using Stream httpStream = await client.GetStreamAsync(url);

await httpStream.CopyToAsync(fileStream);

Console.WriteLine("File Downloaded");
Console.ReadKey();

void CreateHttpClient()
{
    ServiceCollection builder = new();
    builder.AddHttpClient(HttpClientKey);
    ServiceProvider serviceProvider = builder.BuildServiceProvider();

    _httpClientFactory = serviceProvider.GetRequiredService<IHttpClientFactory>();
}