Azure DevOps自托管代理任务下载过慢导致初始化失败

环境 #

• 操作系统：Ubuntu Server 24.04 LTS
• 代理版本：4.264.2
• 虚拟化方式：VirtualBox虚拟机
• 所在地：巴西
• 公网IP：177.55.197.91（IPv4）和2804:56c:b971:2a00:2ca1:4459:faf9:47ad（IPv6）

代理已成功连接并显示在线，但所有任务下载（如NodeTool、UsePythonVersion）均失败。

症状 #

• 下载速度稳定在约10 KB/s
• 初始化最终因“Connection reset by peer”失败
• 管道从未启动实际步骤，仅循环显示“正在下载任务…”

错误截图：

已尝试的操作 #

我在VirtualBox中测试了多种网络/虚拟机配置：

• 桥接适配器
• NAT
• 仅主机模式+NAT
• 更换DNS解析器（谷歌、Cloudflare、本地）
• 禁用防火墙
• 启用防火墙并添加明确允许规则
• 使用Squid配置HTTPS缓存代理

所有场景下问题均存在。

日志详情（完整异常） #

[debug]System.IO.IOException: Unable to read data from the transport connection: Connection reset by peer.
 ---> System.Net.Sockets.SocketException (104): Connection reset by peer
   at System.Net.Sockets.NetworkStream.ReadAsync(Memory`1 buffer, CancellationToken cancellationToken)
   at System.Net.Security.SslStream.EnsureFullTlsFrameAsync[TIOAdapter](CancellationToken cancellationToken, Int32 estimatedSize)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Net.Sockets.SocketAsyncEventArgs.TransferCompletionCallbackCore(Int32 bytesTransferred, Memory`1 socketAddress, SocketFlags receivedFlags, SocketError socketError)
   at System.Net.Sockets.SocketAsyncEngine.System.Threading.IThreadPoolWorkItem.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()
--- End of stack trace from previous location ---

   --- End of inner exception stack trace ---
   at System.Net.Security.SslStream.EnsureFullTlsFrameAsync[TIOAdapter](CancellationToken cancellationToken, Int32 estimatedSize)
   at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16 token)
   at System.Net.Security.SslStream.ReadAsyncInternal[TIOAdapter](Memory`1 buffer, CancellationToken cancellationToken)
   at System.Runtime.CompilerServices.PoolingAsyncValueTaskMethodBuilder`1.StateMachineBox`1.System.Threading.Tasks.Sources.IValueTaskSource<TResult>.GetResult(Int16 token)
   at System.Net.Http.HttpConnection.FillAsync(Boolean async)
   at System.Net.Http.HttpConnection.CopyToContentLengthAsync(Stream destination, Boolean async, UInt64 length, Int32 bufferSize, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnection.ContentLengthReadStream.CompleteCopyToAsync(Task copyTask, CancellationToken cancellationToken)
   at Microsoft.VisualStudio.Services.Agent.Worker.TaskManager.DownloadAsync(IExecutionContext executionContext, TaskStepDefinitionReference task)
   at Microsoft.VisualStudio.Services.Agent.Worker.TaskManager.DownloadAsync(IExecutionContext executionContext, IEnumerable`1 steps)
   at Microsoft.VisualStudio.Services.Agent.Worker.JobExtension.InitializeJob(IExecutionContext jobContext, AgentJobRequestMessage message)

技术问询 #

是否有人遇到过类似情况：Azure DevOps自托管代理仅在下载Azure任务时速度极慢？这是否与VirtualBox网络、巴西CDN节点问题、Azure限流或其他因素有关？恳请提供可行的配置方案、网络调整建议或问题排查思路。

内容的提问来源于stack exchange，提问作者Lucas Venezian Povoa