Hello, I would suggest a DNS problem.
Do you rsync directly to an ip address or are you using avec domain name
?  That would explain why the first only is failing and not the second
one.
The DNS server you use may have some problems during the night.
If you don't use a domain name, this can't be this. If you use one, you
can add it to /etc/hosts to by-pass it. If this continue to fail, the
problem is elsewhere.
I have been monitoring some public dns servers of ISP (with smokeping)
and some of them were unrealiable during the night. 
Regards

De: Chris SmithEnvoyé: mercredi 22 janvier 2014 16:23À: Stuart HendersonCc:
OpenBSD-MiscObjet: Re: unreliable connections

On Mon, Jan 20, 2014 at 11:31 AM, Chris Smith <obsd_m...@chrissmith.org>
wrote:
> have moved the "block all" to the beginning of the ruleset to see if
> it will make any difference

Unfortunately no difference. The attempt to rsync the first directory
failed last night, second one worked fine.

Any other ideas?

Thanks,

Chris

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