Thank you for responding.  This did not work for me.

I restarted both Apache and backuppc and pings still fail.

On Thu, 2011-11-03 at 16:51 -0500, Michael Stowe wrote:
> > I'm seeing backups to a remote host fail from the GUI backup due to
> > error: "no ping response".  What is odd is that the same or equivalent
> > ping command _appears_ to work from the server command line.
> 
> Funnily enough, I saw this behavior recently in my own installation.
> 
> Not that I'm able to explain it, but simply restarting the BackupPC
> service cleared it right up.
> 
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