Received bad initial opcode. Opcode = name
NetBT uses a specific opcode in the name refresh packets. (NetBT stands for NetBIOS, or network basic input/output system, over TCP/IP, or Transmission Control Protocol/Internet Protocol.) The specification for the NetBT protocol is ambiguous in this area. Microsoft implementations use the default value of 8, which appears to be the intended value. However, some other implementations, such as those by Ungermann-Bass, use the default value 9. Two implementations must use the same opcode to interoperate.
Contact your network administrator. The administrator can use a Registry editor (Regedit or Regedt32) to edit the RefreshOpCode parameter to match the host value.