HP 68302 User Manual page 419

Chapter 12: Error Messages
Out of DOS Memory for LAN buffer
Out of DOS Memory for LAN buffer
This means that there is not enough memory in the lower 1 Mbyte of address
space (that is, conventional memory) for the LAN driver to allocate a buffer
to communicate with the LAN TSR.
When you are in windows, and execute the DOS command "mem", you
cannot see the memory that is in the lower 1 Mbyte that is used by the
windows program. If you have the Microsoft program "heapwalker", you can
use it to see what programs have allocated space in the address range 0
through FFFFF.
To fix this, you can:
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Reduce the number of TSRs running on your PC (before Windows starts)
that use conventional memory.
Reconfigure your network to have fewer sockets or modules loaded, or to
be configured for fewer total connections.
Use a different memory manager to reduce your network memory usage,
such as QEMM.