Windows 7 cannot receive XP/android system sends UDP data, but can emit, XP, android can be received,

Sending and receiving the code is written in the JAVA generic code, should be no problem, XP and ANDROD under each other no problem,
Windows 7 firewall has been closed, send the UDP no problem, don't get, TCP text data are all no problem,
In the two Windows 7 (32) phenomenon is same, LAN didn't change, beg god to solve!