Hi, I had a strange issue with network connections.We have a Mail and an Application cluster (3 servers each). However, one Domino Mail Server got some strange errors after a period of time:
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 (see SERVER_MAXSESSIONS parameter in Notes Admin Guide). - Automatically reducing TCPIP port maximum sessions to 4000. Currently, 1 sessions are in the process of being recycled.
I searched the web for this errors and found some hints to use “netstat -a -n” on the command line. There I got a huge list wish connections to out second mail cluster server in the state CLOSE_WAIT. I then used the command again with -b switch (“netstat -a -n -b”). I then saw, that the CLOSE_WAIT mainly were caused by nrouter.exe and nclrepl.exe.
I restartet the two tasks and the connections then were closed. However, after a period of time, the same problem occured again.
After a “little” investigation I found out, that the second mail server had encryption enabled for the tcpip port (all other servers have not). I disabled it, and afterward the problem no longer occurs.
I hope, this will help someone with the same problem.
Greetings
Markus