When using the HP LaserJet 1300 and 1320 with iPrint, printers occasionally stop printing at random times. Power cycling the printer or stopping/starting the printer agent appears to kick start the printers again, but only temporarily.
Add the NOSNMP parameter to the end of the gateway load string to solve this problem permanently.
Here is additional information in Novell's documentation on how to modify the gateway load string: http://www.novell.com/documentation/oes/iprint_lx/data/hx0rwd73.html#am8ab97
Requires a minimum of NetWare 6.5 SP4 (OES SP1). It's also recommended that the Novell gateway be used rather than the now unsupported HP NDPS gateway.
Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).
It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.