cache-control: must-revalidate
I am finding the same problem but under completely different circumstances.
I have a HP OfficeJet Pro 8600 wired connection to router. Two computer wired connection to router. Three computer wireless connections.
Working from wired MS Windows 7, or wired MacBook Pro OSX 10.10, I get into the word processor and make a unique paper size. Exactly 6.96 inches by 3.50 inches. I load paper stock with the identical size.
Trying to print a test page the HP Office Jet Pro throw a size mismatch error. Since all seemed right I turned on my packet sniffer and repeated the test.
Looking at the low level packets the only thing that appears out of the ordinary is this message repeating over and over as I am trying to print.
P.S. This post and its reply have been split off from other thread, moved to Multifunction and All-in-One, and edited its subject. - Hp Forum moderator