TCP/IP protocol stack reported that it ran out of memory

I have a user running Notes Client 4.6.6 on a Win98 Laptop connecting via LAN with 128MB RAM. He receives the following error almost every day at around 4pm!

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"The TCP/IP protocol stack reported that it ran out of memory. Consult your network documentation to increase configured memory, or reduce Notes connections by limiting clients (use SERVER_MAXSESSIONS parameter in Notes Admin Guide)."

We are running 4.6.7 server and in checking our config, the SERVER_MAXSESSIONS parameter is not used.