I had the same problem in Ubuntu 16.04.1. After some testing I removed
all (3) printers and all cups-related packages and reinstalled them. And
now (without any additonal changes) all works fine. The only difference:
The first time I used a port forwarding to the remote print server like
"ssh -L 1631:127.0.0.1:632 someuser@somehost" and a local URl
"127.0.0.1:1631" (because i worked as an unpriviliged user and have a
local CUPS daemon on 631). At some cups-Admin-Pages there where error
pages like "You have to use 127.0.0.1:631...". The second time i stopped
my local cupsd and called "ssh -L 631:127.0.0.1:631 someuser@somehost"
as privileged user.
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cups hang after a while
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