Single-hop (or unknown relay) attempts in 0.2.3

[coderman]

On Thu, Dec 2, 2010 at 5:11 AM, Ian Goldberg <iang at cs.uwaterloo.ca> wrote:
> ...
> every 3-6 hours, I see a group of entries like this in my log:
>
> Dec 02 05:08:17.000 [notice] Attempt by [scrubbed] to open a stream from
> unknown relay. Closing.
> ...
> Any idea what this might be?

i can only speculate; however, back when looking into
https://trac.torproject.org/projects/tor/ticket/1160 someone was using
single hops for malicious exit node checking, other periodic requests.

$0.02