On Fri, Nov 18, 2005 at 03:51:47PM -0800, Paul Yeatman enlightened us:
> ->>In response to your message<<-
>   --received from Jon LaBadie--
> >
> > On Fri, Nov 18, 2005 at 04:03:43PM -0500, Matt Hyclak wrote:
> > > On Fri, Nov 18, 2005 at 11:38:34AM -0800, Paul Yeatman enlightened us:
> > > > ->>In response to your message<<-
> > > >   --received from Paul Bijnens--
> > > > >
> > > > > Paul Yeatman wrote:
> > > > > >
> > > > > 
> > > > > I think the firewall is the cullprit.
> > > > > The server sends a UDP packet with the request for the estimate.
> > > > > When finished the client sends a reply UDP back.
> > > > > But by that time the firewall does not relate the reply to the request
> > > > > and drops or denies the packet.  And hence the client does not receive
> > > > > an ACK and retries 3 times to send the reply and gives up.
> > > > 
> > > > Hmmmm.  Well, that would be easy enough to test but would this explain
> > > > how the smaller backup of the same client/config succeeded?
> > > > 
> > > 
> > > Yes, because it doesn't take as long to generate a backup of 3GB than it
> > > does to backup 17.
> > > 
> > > See http://www.amanda.org/docs/faq.html#id2555136 and try the udp settings
> > > there.
> > 
> > Nor does it take as long to estimate.
> 
> Ok, you all win!  I turned off the server firewall and . . .
> I finally got a successful estimate!
> 
> The backup is currently running.  I assume I need to leave the firewall
> off (or trust this host) for the duration of the run?  I'll either
> simply trust this host and/or check out the web address Matt suggested
> above for a long term answer.
> 
> I find this so weird since the firewall (on the server) has never been
> a problem concerning amanda . . . until now.  I guess that's because
> I've never attempted anything quite like this until now.
> 
> Thanks *everyone* for your comments and feedback!
> 

The problem is probably the udp timeout. (Re-)read
http://www.amanda.org/docs/faq.html#id2555136 for tips on adjusting the
settings for the ip_conntrack_amanda module which should keep things running
nicely.

Matt

-- 
Matt Hyclak
Department of Mathematics 
Department of Social Work
Ohio University
(740) 593-1263