Changing port allocation tactics for the millionth time

tests/Tgstation.Server.Tests/Live/TestLiveServer.cs

@@ -43,7 +43,6 @@ using Tgstation.Server.Host.Database;
 using Tgstation.Server.Host.Extensions;
 using Tgstation.Server.Host.Jobs;
 using Tgstation.Server.Host.System;
-using Tgstation.Server.Host.Utils;
 using Tgstation.Server.Tests.Live.Instance;
 
 namespace Tgstation.Server.Tests.Live
@@ -53,6 +52,7 @@ namespace Tgstation.Server.Tests.Live
 	[TestCategory("RequiresDatabase")]
 	public sealed class TestLiveServer
 	{
+		const ushort InitialPort = 42069;
 		public static readonly Version TestUpdateVersion = new(5, 11, 0);
 
 		static readonly Lazy<ushort> odDMPort = new(() => FreeTcpPort());
@@ -64,6 +64,7 @@ namespace Tgstation.Server.Tests.Live
 
 		static void InitializePorts()
 		{
+			tcpPortCounter = InitialPort;
 			_ = odDMPort.Value;
 			_ = odDDPort.Value;
 			_ = compatDMPort.Value;
@@ -156,38 +157,11 @@ namespace Tgstation.Server.Tests.Live
 			return result;
 		}
 
+		static ushort tcpPortCounter = InitialPort;
+
 		static ushort FreeTcpPort(params ushort[] usedPorts)
 		{
-			ushort result;
-			var listeners = new List<TcpListener>();
-
-			try
-			{
-				do
-				{
-					var l = new TcpListener(IPAddress.Any, 0);
-					l.Start();
-					try
-					{
-						listeners.Add(l);
-					}
-					catch
-					{
-						using (l)
-							l.Stop();
-						throw;
-					}
-
-					result = (ushort)((IPEndPoint)l.LocalEndpoint).Port;
-				}
-				while (usedPorts.Contains(result) || result < 20000);
-			}
-			finally
-			{
-				foreach (var l in listeners)
-					using (l)
-						l.Stop();
-			}
+			ushort result = tcpPortCounter++;
 
 			Console.WriteLine($"Allocated port: {result}");
 			return result;