An application I a built (on Java) requires that I open a multicast socket on 224.0.0.1 so as to send UDP packets. I ran my application on an older Windows XP PC and it works fine. But there seems to be no issues for addresses above 224.0.0.1 (Ex. 224.0.0.2). Additionally, I ran a tracert 224.0.0.1 command on CMD prompt and it gives a Transmit error: code 1232. The same command works fine on the XP pc. Thanks.

1.Have you tried this with firewall disabled? 2. I would give a try to Java specific developer forums. 3. Does this happen without this Java application and on more W 7 hosts? 4. Do the scan sfc /scannow Regards Milos

Milos, I don't think this is a java issue, as I dont have the same problem with an xp machine. I can confirm that windows firewall is turned off. Does Win7 not allow binding to multicast sockets? Edit: I also ran sfc/scannow and it came back with the result Windows Resource Protection did not find any integrity violations.