What causes this error?

[TorOp]

On 3/6/2010 4:07 PM, andrew at torproject.org wrote:
> On Sat, Mar 06, 2010 at 03:00:19PM -0500, torop at optonline.net wrote 0.4K bytes in 7 lines about:
>> Mar 06 14:27:37.436 [Warning] We just marked ourself as down. Are your
>> external addresses reachable?
>
> Well, is your IP address reachable from the Internet?
>

Yes, and I am still getting some light traffic now.

Mar 06 11:46:54.200 [Notice] Self-testing indicates your ORPort is 
reachable from the outside. Excellent. Publishing server descriptor.
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