CUPS "Unable to get printer status (Forbidden)!"

[Richard England]

Timothy Murphy wrote:
> I'm trying to use a printer attached to a USB port
> on a remote machine, but I get the above message.
> I can access the computer in question with
> --------------------------------
> [tim at alice ~]$ telnet 192.168.2.2 631
> Trying 192.168.2.2...
> Connected to 192.168.2.2.
> Escape character is '^]'.
> --------------------------------
>
> I suspect the problem is that the printer is not found,
> whatever name I give to it.
> I see
> --------------------------------
> [Job 66] Unable to get printer status (Forbidden)
> --------------------------------
> in /var/log/cups/error_log on the client machine.
>
> Any elucidation gratefully received.
>
>   
cups (IPP) works through port 631 tcp (and udp ?).   Make certain they 
are not locked down.

~~R