C#•2mo ago

✅ The request was aborted: a protected SSL/TLS channel could not be created

I'm trying to send a web request in .NET 4.8, but I keep getting The request was aborted: a protected SSL/TLS channel could not be created. I've did a lot of googling and people suggested all kinds of stuff, but no matter what I tried it didn't work. Here's stuff I tried:

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls13;
ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;

ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls13;
ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;

I've tried various combinations of security protocols, like specifying just Tls12 which seems to fix it for some, but without any success. When accessing the URL I'm requesting in the browser and check devtools, I can see that it uses a Tls13 encryption. Not sure if that info is of any help.

83 Replies

mini•2mo ago

Unfortunately, I'm bound to .NET 4.8 here since it is an existing codebase that is not mine, which is a bit older and I'm just trying to get to work.

Request = WebRequest.Create(Url) as HttpWebRequest;
Request.KeepAlive = useFallbackPath != true;
Request.Host = Url.Split('/')[2];
Request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
Request.ReadWriteTimeout = System.Threading.Timeout.Infinite;
Request.Timeout = System.Threading.Timeout.Infinite;

Response = Request.GetResponse() as HttpWebResponse;

Request = WebRequest.Create(Url) as HttpWebRequest;
Request.KeepAlive = useFallbackPath != true;
Request.Host = Url.Split('/')[2];
Request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
Request.ReadWriteTimeout = System.Threading.Timeout.Infinite;
Request.Timeout = System.Threading.Timeout.Infinite;

Response = Request.GetResponse() as HttpWebResponse;

@Nikoλas wdym by is the certificate trusted? my browser accepts it fine, not sure why .NET 4.8 wouldnt

ProIcons•2mo ago

.NET and Java are using a "cache" of the CAs

mini•2mo ago

iirc the game servers had an update on their ssl ciphers sometime ago, and around that time it broke

ProIcons•2mo ago

the Trusted CAs

mini•2mo ago

the game server runs on a certificate that should be trusted by windows as usual, nothing special

x0rld•2mo ago

btw remove tls 1.1 and tls 1.0 that could cause some issue

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls13;

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls13;

cap5lut•2mo ago

arent they using the OS' trusted CA pool?

mini•2mo ago

I tried it all, didn't really make a difference

ProIcons•2mo ago

Java certainly isn't i think NET FX didn't too

cap5lut•2mo ago

aaah right, forgot that its .net fx

ProIcons•2mo ago

@mini lets experiment a bit

public static void InitiateSSLTrust()
{
    try
    {
        //Change SSL checks so that all checks pass
        ServicePointManager.ServerCertificateValidationCallback =
           new RemoteCertificateValidationCallback(
                delegate
                { return true; }
            );
    }
    catch (Exception ex)
    {
        ActivityLog.InsertSyncActivity(ex);
    }

public static void InitiateSSLTrust()
{
    try
    {
        //Change SSL checks so that all checks pass
        ServicePointManager.ServerCertificateValidationCallback =
           new RemoteCertificateValidationCallback(
                delegate
                { return true; }
            );
    }
    catch (Exception ex)
    {
        ActivityLog.InsertSyncActivity(ex);
    }

invoke this and see if it makes any difference (do not use it) just for testing ignore the activity log

mini•2mo ago

When do I invoke it?

ProIcons•2mo ago

on startup

mini•2mo ago

there shouldnt be any exceptions, I've tried this code before ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;

ProIcons•2mo ago

and it keeps on failing ?

mini•2mo ago

yup

ProIcons•2mo ago

can we see the detailed exception and can you show me the SSL Cert of the remote service? mask what you have just want the CA

mini•2mo ago

The exception is just the title of the thread, there's no inner exception, nothing https://a.ppy.sh/7562902

ProIcons•2mo ago

mini•2mo ago

That's the avatar server

ProIcons•2mo ago

oh thats the service

ProIcons•2mo ago

ProIcons•2mo ago

i presume you are on Windows?

mini•2mo ago

yup

ProIcons•2mo ago

are you behind a proxy?

mini•2mo ago

It's worth noting that this does work on .NET 8 nop

mini•2mo ago

This did work in csharprepl I believe the issue is specifically related to <=.NET 4.8 I've read a lot about tls/ssl errors related to those older versions

cap5lut•2mo ago

which windows version btw?

ProIcons•2mo ago

https://dotnetfiddle.net/HxLn18

HM | C# Online Compiler | .NET Fiddle

HM | Test your C# code online with .NET Fiddle code editor.

cap5lut•2mo ago

~~TLS 1.3 is supported starting in Windows 11 and Windows Server 2022. Enabling TLS 1.3 on earlier versions of Windows is not a safe system configuration.~~

(https://learn.microsoft.com/en-us/windows/win32/secauthn/protocols-in-tls-ssl--schannel-ssp-)

ProIcons•2mo ago

use only 1.2 SecurityProtocolType.Tls12

mini•2mo ago

tried that as well i tried all kinds of security protocols without success

ProIcons•2mo ago

use hardcoded this code:

using System;
using System.Net;
                    
public class Program
{
    public static void Main()
    {
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
        var Request = WebRequest.Create("https://a.ppy.sh/7562902") as HttpWebRequest;
        var Response = Request.GetResponse() as HttpWebResponse;
        Console.WriteLine(Response.StatusCode);
        
    }
}

using System;
using System.Net;
                    
public class Program
{
    public static void Main()
    {
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
        var Request = WebRequest.Create("https://a.ppy.sh/7562902") as HttpWebRequest;
        var Response = Request.GetResponse() as HttpWebResponse;
        Console.WriteLine(Response.StatusCode);
        
    }
}

on a new project maybe with net 4.8.x this works on dotnetfiddle

cap5lut•2mo ago

this seems to be outdated or so, im on win10 and i still get TLS 1.3

ProIcons•2mo ago

on net 4.7

mini•2mo ago

Ill try in a second. Only thing I can think of is this massive codebase having some code somewhere that messes it up. But I know for a fact that changing ServicePointManager.SecurityProtocol does have an impact on the request because if I set it to Ssl3 i get a different error

ProIcons•2mo ago

SSL is legacy we say SSL these days but its long deprecated TLS is what we all use

mini•2mo ago

yeah I know, just saying

ProIcons•2mo ago

is the project opensource?

mini•2mo ago

nop

ProIcons•2mo ago

is it a UI app ?

cap5lut•2mo ago

its osu isnt it?

mini•2mo ago

yeah It's not a game client, its a tool related to it

ProIcons•2mo ago

Search on project for ServicePointManager and see if there are configurations applied to it

mini•2mo ago

ohhhhhhh

mini•2mo ago

but I'm overwriting it

ProIcons•2mo ago

change it to Tls12 and try

mini•2mo ago

This is in a static constructor, which gets called before the entry point So when I had it in the entrypoint I should've overwritten it, but ill try

ProIcons•2mo ago

also change the Expect100Continue

mini•2mo ago

ohhh it works now how did it not work before when I did the exact same in the entry point oh god I believe I know why

ProIcons•2mo ago

maybe the flow is different than what you think

mini•2mo ago

Are static constructors on referenced libraries only ran when the first piece of code from that library is ran? Because that code is in a static constructor but not in the entry assembly

ProIcons•2mo ago

$itdepends

MODiX•2mo ago

https://cdn.discordapp.com/attachments/569261465463160900/826859856719380500/1niu5wN.png

cap5lut•2mo ago

when trying that it works for me in.net fx 4.8, with just tls3 it doesnt. i guess the browsers dont use the same implementation as .net fx

mini•2mo ago

yup! It runs the entry point first dang it but thanks a lot for the help

cap5lut•2mo ago

static constructors are executed when the type is first used

mini•2mo ago

ohh

cap5lut•2mo ago

so if u never touch a class C which has a static constructor, it will never run

mini•2mo ago

rightt it was only the static <Module>::ctor that runs before the entry point

cap5lut•2mo ago

if it works now, dont forget to $close the thread

MODiX•2mo ago

If you have no further questions, please use /close to mark the forum thread as answered

Unknown User•2mo ago

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ProIcons•2mo ago

.net fx 4.8.2

Unknown User•2mo ago

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ProIcons•2mo ago

i don't know you sir, and i don't want to talk to you 😄

Unknown User•2mo ago

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mini•2mo ago

they are specific to the game server having turned off TLS support Before, they enforced TLS 1.0 now they enforce TLS 1.2+

Unknown User•2mo ago

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mini•2mo ago

so I had to change the code to stop enforcing TLS 1.0 that was the issue of this thread

Unknown User•2mo ago

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mini•2mo ago

maybe, but I know for a fact the game servres changed which TLS they enforce

Unknown User•2mo ago

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mini•2mo ago

i am not talking about httpclient here at all

Unknown User•2mo ago

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mini•2mo ago

yeah it was known to be bad and they eventually did upgrade now

Unknown User•2mo ago

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mini•2mo ago

although they did upgrade because the game servers got blocked in russia and changing to TLS 1.2 fixed it the game servers exist since like 2007 so I assume they never bothered to change

Unknown User•2mo ago

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mini•2mo ago

oh now i remember server side TLS 1.0 was not enforced just supported the game client forced TLS 1.0 I believe and so did the tool I used I think because of backwards compatibility with old stuff because the game client is ooold

Unknown User•2mo ago

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✅ The request was aborted: a protected SSL/TLS channel could not be created