[cups.general] Socket: Failed to read side-channel request

[Michael R Sweet]

Thomas Küstermann wrote:
> Hello!
> 
> I am currently in the process of replacing our plain old cups (version 1.1.x) with newest available one (version 1.3.7 at the moment I write this message).
> 
> We're using the socket backend to print. Now, we've got some problems in printing with the new version. I try to explain:
> ...
> WARNING: Failed to read side-channel request!
 > ...

What driver are you using?

The warning message would seem to indicate the driver is assuming
that file descriptor 4 is for some other purpose, leading to the
error you are seeing.

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Michael R Sweet                        Senior Printing System Engineer