Nejc Škoberne wrote:
I manage around 50 FreeBSD servers and I have created a script which does
some work every 5 minutes. Actually this script transfers some files
to/from
the central server, which is running a OpenSSH's sshd
(OpenSSH_4.5p1 FreeBSD-20061110, OpenSSL 0.9.7e-p1 25 Oct 2004). So I use
sftp (I have also tried scp) on client sides to perform the task.
The problem is, that (apparently because all the servers start transferring
files at approximately the same time), some clients are able to do the
transfers and others are not.
OpenSSH's sshd has a rate limiting mechanism to prevent excessive
numbers of unauthenticated connections at any one time, and it sounds
like you're hitting that limit. Try tweaking the MaxStartups setting
(it defaults to 10) in sshd_config and restarting sshd. There's also
some optional extra parameters to MaxStartups, see sshd_config(5) for
the details.
--
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4 37C9 C982 80C7 8FF4 FA69
Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
