[OmniOS-discuss] Periodic SSH connect failures

[Schweiss, Chip]

On OmniOS r151014 I use ssh with rsa-keys to allow my storage systems to
communicate and launch things like 'zfs receive'

Periodically the connection fails with "ssh_exchange_identification:
Connection closed by remote host"   When this happens about 1/2 the
connection attempts will fail this way for about 10-20 minutes then thing
return to normal.

root at mir-dr-zfs01:/root# ssh -v mirpool02
OpenSSH_6.6, OpenSSL 1.0.1p 9 Jul 2015
debug1: Reading configuration data /etc/opt/csw/ssh/ssh_config
debug1: Connecting to mirpool02 [10.28.125.130] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type 2
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6
ssh_exchange_identification: Connection closed by remote host
root at mir-dr-zfs01:/root# echo $?
255

I've not been able to get logs out of the SunSSH server, turning things on
in /etc/syslog.conf, doesn't seem to work.   What am I am missing in trying
to get more information out of the ssh server?

I used OpenSSH client from OpenCSW, using the SunSSH client and the problem
happens nearly twice as often.

Any suggestions on how to make these connections robust?

Thanks!
-Chip
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