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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1245162 Title: printing hangs reporting 'processing' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/hplip/+bug/1245162/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs