diff --git a/SVSim.BattleNode/Bridge/BattleNodeOptions.cs b/SVSim.BattleNode/Bridge/BattleNodeOptions.cs
index 7210e9f..0e28827 100644
--- a/SVSim.BattleNode/Bridge/BattleNodeOptions.cs
+++ b/SVSim.BattleNode/Bridge/BattleNodeOptions.cs
@@ -1,10 +1,11 @@
 namespace SVSim.BattleNode.Bridge;
 
 /// <summary>
-/// DI-injected options for the battle node. The web host populates these — typically
-/// nodeServerUrl is "ws://localhost:5148" matching ASPNETCORE_URLS.
+/// DI-injected options for the battle node. NodeServerUrl matches the prod
+/// do_matching wire format: <c>host:port/socket.io/</c>, no scheme prefix.
+/// BestHTTP's SocketManager parses it as the Socket.IO v2 endpoint URL.
 /// </summary>
 public sealed class BattleNodeOptions
 {
-    public string NodeServerUrl { get; set; } = "ws://localhost:5148";
+    public string NodeServerUrl { get; set; } = "localhost:5148/socket.io/";
 }
diff --git a/SVSim.EmulatedEntrypoint/Program.cs b/SVSim.EmulatedEntrypoint/Program.cs
index 0ef2d65..8c9596b 100644
--- a/SVSim.EmulatedEntrypoint/Program.cs
+++ b/SVSim.EmulatedEntrypoint/Program.cs
@@ -119,8 +119,9 @@ public class Program
 
         builder.Services.AddBattleNode(opt =>
         {
-            // ASPNETCORE_URLS defaults to http://localhost:5148; we map ws:// onto the same host:port.
-            opt.NodeServerUrl = "ws://localhost:5148";
+            // Matches the prod do_matching wire format: host:port/socket.io/, no scheme prefix.
+            // BestHTTP's SocketManager parses this as the Socket.IO v2 endpoint URL.
+            opt.NodeServerUrl = "localhost:5148/socket.io/";
         });
 
         builder.Services.AddTransient<ShadowverseTranslationMiddleware>();
diff --git a/SVSim.UnitTests/BattleNode/Bridge/MatchingBridgeTests.cs b/SVSim.UnitTests/BattleNode/Bridge/MatchingBridgeTests.cs
index c526ad1..b4c7473 100644
--- a/SVSim.UnitTests/BattleNode/Bridge/MatchingBridgeTests.cs
+++ b/SVSim.UnitTests/BattleNode/Bridge/MatchingBridgeTests.cs
@@ -11,11 +11,11 @@ public class MatchingBridgeTests
     public void RegisterPendingBattle_RegistersInStoreAndReturnsNodeUrl()
     {
         var store = new InMemoryBattleSessionStore();
-        var bridge = new MatchingBridge(store, new BattleNodeOptions { NodeServerUrl = "ws://localhost:5148" });
+        var bridge = new MatchingBridge(store, new BattleNodeOptions { NodeServerUrl = "localhost:5148/socket.io/" });
 
         var match = bridge.RegisterPendingBattle(viewerId: 906243102);
 
-        Assert.That(match.NodeServerUrl, Is.EqualTo("ws://localhost:5148"));
+        Assert.That(match.NodeServerUrl, Is.EqualTo("localhost:5148/socket.io/"));
         Assert.That(match.BattleId, Is.Not.Empty);
         var pending = store.TryGetPending(match.BattleId);
         Assert.That(pending, Is.Not.Null);
diff --git a/SVSim.UnitTests/Controllers/ArenaTwoPickBattleControllerTests.cs b/SVSim.UnitTests/Controllers/ArenaTwoPickBattleControllerTests.cs
index a75d1f9..9aa6b4a 100644
--- a/SVSim.UnitTests/Controllers/ArenaTwoPickBattleControllerTests.cs
+++ b/SVSim.UnitTests/Controllers/ArenaTwoPickBattleControllerTests.cs
@@ -28,7 +28,10 @@ public class ArenaTwoPickBattleControllerTests
         var battleId = root.GetProperty("battle_id").GetString();
         Assert.That(battleId, Is.Not.Null.And.Not.Empty);
         var nodeUrl = root.GetProperty("node_server_url").GetString();
-        Assert.That(nodeUrl, Does.StartWith("ws://"));
+        // Matches prod wire format: host:port/socket.io/, no scheme prefix.
+        Assert.That(nodeUrl, Does.Contain("/socket.io/"));
+        Assert.That(nodeUrl, Does.Not.StartWith("ws://"));
+        Assert.That(nodeUrl, Does.Not.StartWith("http://"));
         // Required when matching_state ∈ {3004,3007,3011} per
         // DoMatchingBase.SettingCardMasterId; client throws KeyNotFoundException without it.
         Assert.That(root.GetProperty("card_master_id").GetInt32(), Is.EqualTo(1));