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!
"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.
What it is telling you is that the server is overloaded on its TCPIP stack. Since you didn't tell me anything else about the server, I can't really offer much advice other than to increase the memory (real and virtual) on the server.
This was first published in May 2001