nessus-update-plugins failing

I too am having trouble with nessus-update-plugins failing, running
version 2.2.6 of Nessus.  I've got it running from cron once a day at
about 8pm local time (GMT +0100), and it has only succeeded once in the
last few weeks - on Sunday 9th if that makes any difference.  I've
turned on the -vv option to try and get more detail, but it doesn't help
much.

Sometimes it fails at this stage:

+ /usr/local/bin/nessus-fetch --plugins-md5

More often at this stage:

+ /usr/local/bin/nessus-fetch --plugins
[22570] plug_set_key:internal_send(0)['3 /tmp/ConnectTimeout/TCP/443=1;
']: Socket operation on non-socket
Could not open connection to plugins.nessus.org - Socket operation on
non-socket
+ echo 'Could not retrieve the Nessus plugins'
Could not retrieve the Nessus plugins
+ echo Aborting
Aborting
+ exit 1

It leaves behind it in the /tmp directory all-2.0.tar.gz.md5 and an
empty all-2.0.tar.gz.  If it fails at the earlier stage the error
message is almost identical and I'm left with just an empty md5 file.

Is this simply that I'm connecting at a time which is too busy and
nessus-fetch is handling the timeout badly?  Can you suggest a better
time?

-- 
Eleanor Blair                                           ecb39@eng.cam.ac.uk
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