thanks i solved this problem.
The key is
new byte[]{0x21, 0x00, 0x00, 0x00, 0x56, 0x00, 0x00, 0x00,(byte) 0xDE, 0x00, 0x00, 0x00, (byte) 0x76, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x00, 0x00, 0x44, 0x00, 0x00, 0x00, (byte) 0xD6, 0x00, 0x00, 0x00,(byte) 0x8B, 0x00, 0x00, 0x00},
but necessery alter server side ^^