OpenRA

Error Log:

OpenRA engine version release-20210321
Red Alert mod version release-20210321
on map b15ed0de59c498fe9a3e20cfde1d90f0117aa739 (Desert Shellmap by Scott_NZ).
Date: 2021-06-01 21:52:39Z
Operating System: OSX (Unix 19.6.0.0)
Runtime Version: Mono 6.4.0.198 (2019-06/fe64a4765e6 Wed Sep 18 14:14:51 EDT 2019) CLR 4.0.30319.42000
Exception of type `System.ArgumentOutOfRangeException`: Specified argument was out of the range of valid values.
Parameter name: port
at System.Net.IPEndPoint..ctor (System.Net.IPAddress address, System.Int32 port) [0x0001c] in <6aa0b19d109a447c94d1b43ec4471dc6>:0
at OpenRA.Game.CreateServer (OpenRA.ServerSettings settings) [0x00005] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Mods.Common.Widgets.Logic.ServerCreationLogic.CreateAndJoin () [0x000db] in <15ed584efd4c42b4a11c49d2c6cfb506>:0
at OpenRA.Mods.Common.Widgets.ButtonWidget.<.ctor>b__42_5 (OpenRA.MouseInput _) [0x00000] in <15ed584efd4c42b4a11c49d2c6cfb506>:0
at OpenRA.Mods.Common.Widgets.ButtonWidget.HandleMouseInput (OpenRA.MouseInput mi) [0x00076] in <15ed584efd4c42b4a11c49d2c6cfb506>:0
at OpenRA.Widgets.Widget.HandleMouseInputOuter (OpenRA.MouseInput mi) [0x00097] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Widgets.Ui.HandleInput (OpenRA.MouseInput mi) [0x0001e] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.DefaultInputHandler+<>c__DisplayClass5_0.<OnMouseInput>b__0 () [0x00000] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Sync.RunUnsynced[T] (System.Boolean checkSyncHash, OpenRA.World world, System.Func`1[TResult] fn) [0x00023] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.DefaultInputHandler.OnMouseInput (OpenRA.MouseInput input) [0x0000d] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Platforms.Default.Sdl2Input.PumpInput (OpenRA.Platforms.Default.Sdl2PlatformWindow device, OpenRA.IInputHandler inputHandler, System.Nullable`1[T] lockedMousePosition) [0x00238] in <ef59421d958f4a12a4f126a9c5ba05dd>:0
at OpenRA.Platforms.Default.Sdl2PlatformWindow.PumpInput (OpenRA.IInputHandler inputHandler) [0x00006] in <ef59421d958f4a12a4f126a9c5ba05dd>:0
at OpenRA.Renderer.EndFrame (OpenRA.IInputHandler inputHandler) [0x0009f] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Game.RenderTick () [0x001ba] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Game.Loop () [0x0015a] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Game.Run () [0x0003c] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Game.InitializeAndRun (System.String[] args) [0x00010] in <b2929aaf82634213b72ac90bbb9d3dd9>:0
at OpenRA.Launcher.Program.Main (System.String[] args) [0x00044] in <2173314defb2480ab12d714bd69ebcd6>:0

The "port" you have specified seems to be invalid. Did you try using the default value?