The HCL Domino product documentation entry What's new in Domino 12? > What's new in 12.0? mentiones changes to the "TCP/IP port buffer size":
Domino 12 has changed the TCP/IP port buffer default size from 4000 to 8000.
Rather spares info, I would say. Fortunately for us, Defect Article KB0098671 provides us with more details:
There's a change in HCL Domino v12, where we increased the network buffer size from a default of 4000 to 8000 as we noticed some network operations needed additional memory. Increasing the network buffer further from 8000 to 8100 by making the below change in the server's notes.ini file, the server stops crashing and gets stable.
Change
TCPIP=TCP,0,15,0,,12320
to
TCPIP=TCP,0,15,8100,,12320
And add the below parameter as well.
debug_net_max_buffer_size=8100
So check your notes.ini if you upgraded from an ealier release (remember Domino 9 an 10 are already EOL, Domino 11 will be in June) and did not recreate the notes.ini in the process.
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