Got it!
Not an ubuntu or cups bug in the end, at least so it appears.
It is the wifi access point / adsl unit.
With the zyxel prestige 600 it does not work
With any other wifi access point / adsl it works.
Now... why should an access point interfere with lan to lan
communication on the 9100 port?
** Changed in: hplip (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1245162
Title:
printing hangs reporting 'processing'
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