All,
I am using a fresh install of Slackware 14. I have the ssh daemon running.
I am attempting a test of a full scale system that will cause a large number of SSH connections to open on the server at the same time. To that end, I wrote a script that will create 10,000 ssh sessions, however, after about 2000 sessions no more connections over ssh are possible.

I am connecting via ssh with the following command:
I have certificates set up so that passwords are unnecessary.

Does anyone have any idea why after 1999 successful connections I get this error:
Tailing the /var/log/messages file provides no further evidence as to why these connections are being ignored. It's full of lines like this:
There seems to be no indication of rejection or ignoring of further connections. There is plenty of ram and cpu available, so it's not a resource issue, as far as I can tell.

Any ideas of where I can begin to look for this artificial limit?

thanks,
-Allen

found the issue

The 2000 connection limit appears to be a problem with my client and not my server. I set up a second client (both running ubuntu 12) to start hitting the server with connections, and was able to link up another 1267 connections.
Then I set up a third client and ran it up to 6200 connections when my server ran out of memory.

Not sure why my clients were limiting, but at least I found a way around it.

1 members found this post helpful.