Apparently I did something magical on one install and not the others.
Wireshark shows the first request packet going to the mw-serve server on the
working machine, but no such communication attempt on the failing machines.
No firewall software is running and the failing machines can ping the
mw-serve server.  So either some other network filter is blocking
communication, or my Collection setup is somehow different.

> -----Original Message-----
> From: trueskew [mailto:[email protected]] 
> Sent: Monday, November 29, 2010 4:14 AM
> To: '[email protected]'
> Subject: RE: [mwlib] mw-serve works with one Mediawiki site 
> but not the other
> 
> Thanks, this is helping... I know this is about me not 
> understanding how this works well enough.
> 
> On Machine A, I've got mwlib and mwlib.rl installed, and 
> mw-serve running.  
>   It's IP address is 10.3.3.118.
> 
> On Machine B, hostname wiki.internal.com, I've got mediawiki running
>   with the Collection extension.  It's pointing Machine A by setting 
>     require_once( "$IP/extensions/Collection/Collection.php");
>     $wgCollectionMWServeURL = "http://10.3.3.118:8899/";;
> 
> I run a browser on Machine C and view 
> "http://wiki.internal.com/main"; to see my homepage.  I can 
> build a book and render and download the pdf file for it.  On 
> Machine A, mw-serve.log and mw-render.log show the messages 
> resulting from rendering the pdf file.
> 
> My problem now is that Machine B is a test machine and needs 
> to be replaced with Machine X.  But somehow just installing 
> the Collection extension and updating LocalSettings.php isn't 
> enough.  All that happens is Machine C shows a blank page, 
> and Machine A shows no log file updates at all.
> 
> In this description, what can I do to "turn on debug 
> messages", "enable verbose mode", etc., on Machine C or 
> Machine X to see why things are behaving differently?
> 
> > -----Original Message-----
> > From: [email protected] 
> [mailto:[email protected]] On Behalf 
> > Of Ralf Schmitt
> > Sent: Monday, November 29, 2010 3:21 AM
> > To: [email protected]
> > Subject: Re: [mwlib] mw-serve works with one Mediawiki site but not 
> > the other
> > 
> > "trueskew" <[email protected]> writes:
> > 
> > >> it looks like you're trying to talk to mw-serve here. 
> you need to 
> > >> specify the base url of your mediawiki as the parameter to -c.
> > >
> > > mw-render is on the mediawiki machine.  If I specify its
> > URL using the
> > > -c argument, where do I specify the IP address of mw-serve,
> > running on
> > > a different machine?
> > 
> > You don't have to. mw-render just talks to mediawiki's api.php, it 
> > doesn't talk to mw-serve. mw-serve runs mw-zip/mw-render in 
> order to 
> > generate a pdf.
> > 
> > Cheers,
> > - Ralf
> > 
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