Clients hang after "restoring resolver state... [OK]"

[John Hupp]

I have been working on building an LTSP server that runs Lubuntu 14.04.1 
i386 desktop and uses LTSP-PNP to build the image.

Clients were booting in a test setup as of a month or so ago.  But now 
they don't.  If I Esc out of the Plymouth splash screen, boot hangs just 
after the screen displays the boot.log message:
* restoring resolver state ...                           [OK]

The last couple lines of the server syslog:
nbd_server: size of exported file is 536xxxxxx
ldminfod: connect from 192.168.1.47

Can anyone recognize the problem or advise me on how to troubleshoot it?
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