[cups-devel] FYI: duplex not working ("Transport endpoint is not connected")

Hello,

this is a follow up to an older thread:

https://lists.cups.org/pipermail/cups/2016-January/027429.html
https://lists.cups.org/pipermail/cups/2016-February/027491.html


With a new cups server and RHEL7 clients
the problem above was still present.

- in google-chrome (cannot print in color, no ppds)
- QT/KDE 4.x (slow startup time, no ppds)

The solution was to configure on the cups server NOT

- ipp://mfp6030.printer.domain.com:631

but

- socket://mfp6030.printer.domain.com:9100

with this the client does not:

- tries to connect the printer directly
- does not run into a network problem (timeout)

==> problem solved.

Additionally the qt/chrome client somehow gets a working ppd and
works as expected.

In short: Don't use ipp:// to print from the server to an
internal printer, only use socket://.

Is this a bug?
Maybe in Qt/chrome?

regards,

Martin