Re: OpenSSH's sshd drops connections

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)
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    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.