JoinMulticastGroup

[udir]

Hi, When running the following code try { System.Net.IPAddress multicastaddress = System.Net.IPAddress.Parse("224.0.0.1"); udpclient.JoinMulticastGroup(multicastaddress, 50); } catch ( SocketException e ) { Console.WriteLine( e.ToString()); } On XP with service pack 2, I am recieving the following excetion : "An invalid argument was supplied" while the same code runs perfectly good on windows 2000 computers. Any idea ? Thanks in advance, Udi Raz

[leppie]

udir wrote: Console.WriteLine( e.ToString()); Add this too. Console.WriteLine( e.GetBaseException()); Should give you a better idea. xacc-ide 0.0.15 now with C#, MSIL, C, XML, ASP.NET, Nemerle, MyXaml and HLSL coloring - Screenshots

[udir]

Thanks but didn't help much. "System.Net.Sockets.SocketException: An invalid argument was supplied at System.Net.Sockets.Socket.setMulticastOption(SocketOptionName optionName, MulticastOption MR) at System.Net.Sockets.Socket.SetSocketOption(SocketOptionLevel optionLevel, SocketOptionName optionName, Object optionValue) at System.Net.Sockets.UdpClient.JoinMulticastGroup(IPAddress multicastAddr) at DVP.Do.AddMsgToLog(String msg, Int32 port, String ip) in c:\\dev\\net\\core\\dvp\\dvp.cs:line 664" I tried to remove the FireWall, but still nothing. Maybe there is a security problem, maybe the XP does not allow communication through the port ???? Thanks again, Udi