diff --git a/DevProxy/Program.cs b/DevProxy/Program.cs
index 78912573..a7fbf784 100644
--- a/DevProxy/Program.cs
+++ b/DevProxy/Program.cs
@@ -107,11 +107,22 @@ static async Task<int> StartDetachedProcessAsync(string[] args)
             await Task.Delay(200);
 
             var state = await StateManager.LoadStateAsync();
-            if (state != null)
+            if (state is { Port: > 0 })
             {
+                Uri? apiUri = null;
+                if (!string.IsNullOrWhiteSpace(state.ApiUrl))
+                {
+                    Uri.TryCreate(state.ApiUrl, UriKind.Absolute, out apiUri);
+                }
+
+                // Build proxy URL in a way that correctly handles IPv6 hosts.
+                string hostForProxy = apiUri?.Host ?? IPAddress.Loopback.ToString();
+                var proxyUriBuilder = new UriBuilder(Uri.UriSchemeHttp, hostForProxy, state.Port);
+                var proxyUrl = proxyUriBuilder.Uri.ToString().TrimEnd('/');
                 await Console.Out.WriteLineAsync("Dev Proxy started in background.");
                 await Console.Out.WriteLineAsync();
                 await Console.Out.WriteLineAsync($"  PID:       {state.Pid}");
+                await Console.Out.WriteLineAsync($"  Proxy URL: {proxyUrl}");
                 await Console.Out.WriteLineAsync($"  API URL:   {state.ApiUrl}");
                 await Console.Out.WriteLineAsync($"  Log file:  {state.LogFile}");
                 await Console.Out.WriteLineAsync();
diff --git a/DevProxy/Proxy/ProxyEngine.cs b/DevProxy/Proxy/ProxyEngine.cs
index 6f353a8f..0b153a6b 100755
--- a/DevProxy/Proxy/ProxyEngine.cs
+++ b/DevProxy/Proxy/ProxyEngine.cs
@@ -6,6 +6,7 @@
 using DevProxy.Abstractions.Proxy;
 using DevProxy.Abstractions.Utils;
 using DevProxy.Commands;
+using DevProxy.State;
 using Microsoft.VisualStudio.Threading;
 using System.Collections.Concurrent;
 using System.Diagnostics;
@@ -141,6 +142,20 @@ protected override async Task ExecuteAsync(CancellationToken stoppingToken)
         ProxyServer.AddEndPoint(_explicitEndPoint);
         await ProxyServer.StartAsync(cancellationToken: stoppingToken);
 
+        // Update config with actual port (resolves port 0 to OS-assigned port)
+        _config.Port = _explicitEndPoint.Port;
+
+        // Update state file with actual port so detach parent gets the resolved port
+        if (DevProxyCommand.IsInternalDaemon)
+        {
+            var state = await StateManager.LoadStateAsync(stoppingToken);
+            if (state is not null)
+            {
+                state.Port = _config.Port;
+                await StateManager.SaveStateAsync(state, stoppingToken);
+            }
+        }
+
         // run first-run setup on macOS
         FirstRunSetup();