Question

I’m testing MonoTouch (the idea of developing in C# rather than objective-C sounds great). I wrote a very simple app, that compiles well, and runs nicely on the simulator.

But whenever I add breakpoints and hit Debug, I get:

System.Net.Sockets.SocketException: Address already in use
  at System.Net.Sockets.Socket.Bind (System.Net.EndPoint local_end) [0x00000] in <filename unknown>:0 
  at Mono.Debugger.Soft.VirtualMachineManager.BeginListen (System.Net.IPEndPoint dbg_ep, System.Net.IPEndPoint con_ep, System.AsyncCallback callback) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Debugger.Soft.RemoteSoftDebuggerSession.StartListening (MonoDevelop.Debugger.Soft.RemoteDebuggerStartInfo dsi) [0x00000] in <filename unknown>:0 
  at MonoDevelop.Debugger.Soft.IPhone.IPhoneDebuggerSession.OnRun (Mono.Debugging.Client.DebuggerStartInfo startInfo) [0x00000] in <filename unknown>:0 
  at Mono.Debugging.Client.DebuggerSession+<Run>c__AnonStorey6.<>m__2 () [0x00000] in <filename unknown>:0 

I’ve tried reading the documentation and FAQs, changing targets, and almost every other solution I could google (most weren’t relevant – it seems this error mostly crops up when you develop ASP.Net Mono projects). I’m really hoping there’s a simple”turn that switch” solution to this.

For the record, I’m using:

1. MonoDevelop 2.4.2
2. MonoFramework-2.10.1_3
3. MonoTouch 4 Trial (could that be blocking debugging?)
4. Mac O X 10.6.7
5. Libraries added: System.Net, System.Text, System.IO and reference to System.Json

As always, thanks for your time,

Guy

Answer 1

Sounds like some other process is using the same port that the soft debugger is trying to use.

Try this command in terminal:

sudo lsof -i -P | grep -i "listen"

It should help you figure out what process is causing the issue. Hopefully it is something you can close/kill or remove from your Mac.