What was in your /etc/cups/client.conf (now /etc/cups/client.conf_bak)?
If it pointed to a CUPS on a remote machine, all your CUPS access (from
applications/command line, not web interface) was directed to the remote
machine with a different CUPS setup. Now you are using always the CUPS
on your local machine.
Note that client.conf is deprecated but still working as originally
intended (and so often an admin's nightmare).
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cups hang after a while
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