Network.TestConnection() crashes the app on lan?

Hi all,

just as i wrote in the title, my app crashes if i am in a local network without access to the internet when i use Network.TestConnection().

my game starts normaly, i set the ip and port for the masterserver in Start(), but when i click on my gui for the internet server browser (which runs TestConnection - see code down the page), it crashes the program if i have no internet available.
if i plug out the lan cable completely, it doesnt crash - just if there is LAN only with no internet.
and i dont get any informations in output_log.txt
in mac i got sth like (but i dont know what this says):

some code:

Code (csharp):

1. function Update()
2. {
3.     if (!doneTesting  curGuiWindow == eActiveGuiWindow.serverBrowser )
4.     {
5.         TestConnection();
6.     }
7.  
8. }
9.  
10. // this function is out of the networking demo!
11. function TestConnection() {
12.     // Start/Poll the connection test, report the results in a label and react to the results accordingly
13.     natCapable = Network.TestConnection();
14.     switch (natCapable) {
15.         case ConnectionTesterStatus.Error:
16.             testMessage = "Problem determining NAT capabilities";
17.             doneTesting = true;
18.             break;
19.            
20.         case ConnectionTesterStatus.Undetermined:
21.             testMessage = "Undetermined NAT capabilities";
22.             doneTesting = false;
23.             break;
24.            
25.         case ConnectionTesterStatus.PrivateIPNoNATPunchthrough:
26.             testMessage = "Cannot do NAT punchthrough, filtering NAT enabled hosts for client connections, local LAN games only.";
27.             filterNATHosts = true;
28.             Network.useNat = true;
29.             doneTesting = true;
30.             break;
31.            
32.         case ConnectionTesterStatus.PrivateIPHasNATPunchThrough:
33.             if (probingPublicIP)
34.                 testMessage = "Non-connectable public IP address (port "+ serverPort +" blocked), NAT punchthrough can circumvent the firewall.";
35.             else
36.                 testMessage = "NAT punchthrough capable. Enabling NAT punchthrough functionality.";
37.             // NAT functionality is enabled in case a server is started,
38.             // clients should enable this based on if the host requires it
39.             Network.useNat = true;
40.             doneTesting = true;
41.             break;
42.            
43.         case ConnectionTesterStatus.PublicIPIsConnectable:
44.             testMessage = "Directly connectable public IP address.";
45.             Network.useNat = false;
46.             doneTesting = true;
47.             break;
48.            
49.         // This case is a bit special as we now need to check if we can
50.         // cicrumvent the blocking by using NAT punchthrough
51.         case ConnectionTesterStatus.PublicIPPortBlocked:
52.             testMessage = "Non-connectble public IP address (port " + serverPort +" blocked), running a server is impossible.";
53.             Network.useNat = false;
54.             // If no NAT punchthrough test has been performed on this public IP, force a test
55.             if (!probingPublicIP)
56.             {
57.                 Debug.Log("Testing if firewall can be circumnvented");
58.                 natCapable = Network.TestConnectionNAT();
59.                 probingPublicIP = true;
60.                 timer = Time.time + 10;
61.             }
62.             // NAT punchthrough test was performed but we still get blocked
63.             else if (Time.time > timer)
64.             {
65.                 probingPublicIP = false;        // reset
66.                 Network.useNat = true;
67.                 doneTesting = true;
68.             }
69.             break;
70.         case ConnectionTesterStatus.PublicIPNoServerStarted:
71.             testMessage = "Public IP address but server not initialized, it must be started to check server accessibility. Restart connection test when ready.";
72.             break;
73.         default:
74.             testMessage = "Error in test routine, got " + natCapable;
75.     }
76.     Debug.Log(natCapable + " " + probingPublicIP + " " + doneTesting);
77. }
78.  

additional information:
i am using unity pro 2.1.0 licence,
same bug/behaviour/crash on windows mac binaries in editor

EDIT / PS:
it crashes also if i start a server on LAN without internet
code:

Code (csharp):

1. Network.useNat = !Network.HavePublicAddress();
2. Network.InitializeServer(15, serverPort);
3. MasterServer.RegisterHost(gameName, serverName, comments);