[Question]: How can i connect self hosted agent with Azure DevOps behind proxy on UBI8/9

[Razniak]

Describe your question

Hi,

I'm trying to solve a proxy authorization problem. I have an agent built on ubi8 which does not have the gssntlmssp package. I can build it from source or download it from another host, but it has a number of dependencies, which makes the whole task difficult. The agent itself cannot connect to the proxy using the user and password and throws the error: GSSAPI operation failed with error - Unspecified GSS failure, my question is, is there any other way to authenticate on the proxy using the agent? Unfortunately, our only option is NTLM.

Versions

Ubi8, agent v3.240.1

Environment type (Please select at least one enviroment where you face this issue)

• Self-Hosted
• Microsoft Hosted
• VMSS Pool
• Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Operation system

Ubi8

Version controll system

No response

Azure DevOps Server Version (if applicable)

No response

[stephanieaaltra]

I am encountering an issue while trying to run the ./config script on my Ubuntu 22.04.4 server.
The server is behind a proxy, and I am receiving the following error related to GSSAPI authentication:
GSSAPI operation failed with error - Unspecified GSS failure.

System.ComponentModel.Win32Exception (0x80090020): GSSAPI operation failed with error - No credentials were supplied, or the credentials were unavailable or inaccessible (SPNEGO cannot find mechanisms to negotiate).
   at System.Net.NTAuthentication.GetOutgoingBlob(Byte[] incomingBlob, Boolean throwOnError, SecurityStatusPal& statusCode)
   at System.Net.NTAuthentication.GetOutgoingBlob(String incomingBlob)
   at System.Net.Http.AuthenticationHelper.SendWithNtAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean isProxyAuth, HttpConnection connection, HttpConnectionPool connectionPool, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.AuthenticationHelper.SendWithAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean preAuthenticate, Boolean isProxyAuth, Boolean doRequestAuth, HttpConnectionPool pool, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.EstablishProxyTunnelAsync(Boolean async, HttpRequestHeaders headers, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.AddHttp11ConnectionAsync(HttpRequestMessage request)
   at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.GetHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.AuthenticationHelper.SendWithAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean preAuthenticate, Boolean isProxyAuth, Boolean doRequestAuth, HttpConnectionPool pool, CancellationToken cancellationToken)
   at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at Microsoft.VisualStudio.Services.Common.VssHttpMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at Microsoft.VisualStudio.Services.Common.VssHttpRetryMessageHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
   at System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)

Expected Behavior:

The ./config script should run successfully, even when behind a proxy.

Actual Behavior:

The script fails to run due to authentication errors related to proxy configuration.

Thank you for your assistance!