Comment 38 for bug 42802

@manu
I realy wonder what to put here - we already tried to find out what the problem is, but we didn't came up with a satifying conclusion.
Anyway here are some proposals (pick one if you like):

/usr/lib/cups/backend/http failed
or
Print file was not accepted (Bad Request)!
(/usr/lib/cups/backend/ipp) stopped with status 1!
or
upsdAuthorize: Local authentication certificate not found!

I am afraid of putting a misleading description.