You can increase the reliability of a RAS application that communicates extensively with broadcasts or multicasts by increasing the number of datagrams that can be buffered by the NetBIOS gateway.
Use Regedt32 to navigate to:
Double-click the MaxBcastDgBuffered value name in the right hand pane. The default data value for this type REG_DWORD entry is 32 (0x20 in hexadecimal). The range is 16 - 255.