// The message start string is designed to be unlikely to occur in normal data.
// The characters are rarely used upper ascii, not valid as UTF-8, and produce
// a large 4-byte int at any alignment.
-char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
+unsigned char pchMessageStart[4] = { 0xf9, 0xbe, 0xb4, 0xd9 };
bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)