On Thu, 20 Apr 2000, Alfred Huger wrote:
In case anyone is interested, scanning HP printers with
tools such as nmap will cause the printer to lock up hard.
I discovered this while trying to diagnose a connection
problem we were having with a printer.
I've verified this with at least the following versions of
JetDirect:
Firmware Rev. : A.08.06
Firmware Rev. : G.08.03
Firmware Rev. : G.07.17
Firmware Rev. : G.07.03
I haven't been able to establish the exact communications
causing the lockup; someone with more experience than I
should check this out.
Any network accessable printer can be put out of service
with a simple nmap -sT -PT HP.printer.tcp.ip
A power cycle is required for reset.
This sounds like it might be related to an older bug in the JetDirect
cards - about 3 years ago, simultanious connections to a JetDirect card
would cause the card to lock up, with the only recourse being a power
cycle of the printer.
Multiple (2+) TCP connections would trigger this, as would AppleTalk/TCP.
I haven't checked it in a couple of years, but it was certainly persistant
through multiple revs of the JetDirect cards.
cheers!
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