Received bad opcode. Opcode = filename
NetBios over TCP/IP (NBT) uses a specific opcode in the name refresh packets. The specification for the NBT protocol is ambiguous in this area. Although the default of 8 used by Microsoft implementations appears to be the intended value, some other implementations, such as those by Ungermann-Bass, use the value 9. Two implementations must use the same opcode to interoperate.
Contact your system administrator to use the Registry Editor to edit the RefreshOpCode parameter to match the host value.