How to perform ntlm authentication when using alpine as base image?

[smartaquarius10]

Hello,

We are trying to make ntlm authentication call to rest api but error is coming. We have followed the steps mentioned here but, nothing is working. Our application is hosted in Azure AKS. Any suggestions please

Code

               var cred= new CredentialCache();
                cred.Add(new Uri("url"), "NTLM", new NetworkCredential("user", "pwd", "***.com"));

                var hwd= new HttpClientHandler() { Credentials = credentialsCache, PreAuthenticate = true };
                
                hwd.ClientCertificateOptions = ClientCertificateOption.Manual;
                hwd.ServerCertificateCustomValidationCallback =
                    (httpRequestMessage, cert, cetChain, policyErrors) => true;
                hwd.UseDefaultCredentials = false;

                var client = new FlurlClient(new HttpClient(hwd) { Timeout = new TimeSpan(0, 0, 30) };);
                 var response = await request
                    .AllowHttpStatus(HttpStatusCode.NotFound)
                    .WithHeader("Accept", "application/json")
                    .WithClient(client)
                    .WithHeader("Content-Type", "application/json; charset=utf-8")
                    .GetAsync();

Exception

Flurl.Http.FlurlHttpException: Call failed. NTLM authentication is not possible with default credentials on this platform: 
System.PlatformNotSupportedException: NTLM authentication is not possible with default credentials on this platform. at

POD base image

NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.16.3
PRETTY_NAME="Alpine Linux v3.16"

dotnet version:- 6.0.14

[smartaquarius10]

Hey @Maoni0 @richlander, sorry for tagging you directly. If possible could you please help us here. Our production environment is impacted because of this issue. Would be grateful for help and support.

[Maoni0]

@mangod9 do you know who might be able to help with this?

[mangod9]

Looks to be related to this issue: https://github.com/dotnet/runtime/issues/66633. Might make sense to discuss on that issue.

[smartaquarius10]

Thank you so much @Maoni0 @mangod9

We entered into a war room yesterday for 7 hours but unable to figure out anything. As a backup plan we can only change the base image from alpine to someone else. But, it requires approvals and lots of changes in our ci/cd pipelines.

Once you have any updates please let me know. Really appreciate. Have a great weekend.