This same message started printing almost daily on our HP LaserJet Enterprise M612 printers. Most are connected using USB and two are on the network. This also prints if we reboot the printers. I tried updating one of the printers to the newest firmware. After the upgrade it still does the same thing.
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Re: POST/ipp/print HTTP/1.1 Connection: Keep-Alive Content-Type: application/ipp User-Agent: Windows
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