Printing via ipp to Minolta Magicolor 2430DL fails, client-error-document-format-not-supported

Binary package hint: cupsys

Feisty, latest updates.

The URL of my printer is http://mc2430dl777354.local:631/ipp
I've verified this, it works from Firefox and produces a page of printer attributes.

I went directly to the CUPS web-based backend to configure the printer, to minimize the number of variables involved. Selected Minolta magicolor 2430 DL Foomatic/foo2zjs (recommended). Got prompted with appropriate options for page size, color mode, etc.

Printer appears in the printer list in the CUPS web interface, so I hit Print test page. Job starts, goes into the queue. After a while, job goes to Hold state. Checking the CUPS error log I see:

E [13/Jul/2007:14:01:17 -0500] [Job 7] Print file was not accepted (client-error-document-format-not-supported)!
E [13/Jul/2007:14:01:17 -0500] PID 6149 (/usr/lib/cups/backend/http) stopped with status 1!

Just for fun, I also tried setting up another printer with the same URL, but using the Minolta magicolor 2400W Foomatic/m2400w (recommended) driver, which is the official Minolta driver built from the GPL sources. Exact same error:

E [13/Jul/2007:14:10:08 -0500] [Job 8] Print file was not accepted (client-error-document-format-not-supported)!
E [13/Jul/2007:14:10:08 -0500] PID 6913 (/usr/lib/cups/backend/http) stopped with status 1!