From b3a60e6b0630a15b2daa549429b9ae2cf19f4400 Mon Sep 17 00:00:00 2001
From: Tingluo Huang <tingluohuang@github.com>
Date: Thu, 13 Nov 2025 13:24:09 -0500
Subject: [PATCH] Retry http error related to DNS resolution failure. (#4110)

---
 src/Sdk/Common/Common/VssHttpRetryMessageHandler.cs | 8 ++++----
 src/Sdk/Common/Common/VssNetworkHelper.cs           | 1 +
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/Sdk/Common/Common/VssHttpRetryMessageHandler.cs b/src/Sdk/Common/Common/VssHttpRetryMessageHandler.cs
index 237af57e1..144aeb3eb 100644
--- a/src/Sdk/Common/Common/VssHttpRetryMessageHandler.cs
+++ b/src/Sdk/Common/Common/VssHttpRetryMessageHandler.cs
@@ -1,14 +1,14 @@
-using GitHub.Services.Common.Diagnostics;
-using System;
+using System;
+using System.Collections.Generic;
 using System.ComponentModel;
 using System.Diagnostics;
+using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
-using System.Collections.Generic;
-using System.Linq;
+using GitHub.Services.Common.Diagnostics;
 using GitHub.Services.Common.Internal;
 
 namespace GitHub.Services.Common
diff --git a/src/Sdk/Common/Common/VssNetworkHelper.cs b/src/Sdk/Common/Common/VssNetworkHelper.cs
index 209b86825..9ddeba933 100644
--- a/src/Sdk/Common/Common/VssNetworkHelper.cs
+++ b/src/Sdk/Common/Common/VssNetworkHelper.cs
@@ -146,6 +146,7 @@ namespace GitHub.Services.Common
                     sockEx.SocketErrorCode == SocketError.TimedOut ||
                     sockEx.SocketErrorCode == SocketError.HostDown ||
                     sockEx.SocketErrorCode == SocketError.HostUnreachable ||
+                    sockEx.SocketErrorCode == SocketError.HostNotFound ||
                     sockEx.SocketErrorCode == SocketError.TryAgain)
                 {
                     return true;