SNMP
a. Do community names of the installed HP UPD host match the community name of target print
product?
b. Does the HP UPD installed host firewall allow SNMP traffic?
c. If the HP UPD installed host is on a separate subnet, does the network route SNMP traffic?
d. Wireless network security often disable SNMP routing as a security measure.
7. Install and test a new print queue?
Reducing complexity to isolate variables. A simple test is to install the UPD driver taken from
www.hp.com/go/upd using the default installation options onto a clean system. This insures the driver
has not been pre-configured before installation, that upgrade from one version to the next in a
contaminated environment is reduced, and the print queue itself is new and self managed. During
installation, create a new print queue targeted to a device with an address on the test machine’s
subnet.
8. Is the network congested?
HP UPD bidi uses SNMP protocol, which is carried on the network using HP UPD protocol. HP UPD
packets are low priority, and can be discarded if the network is congested.
FAQ
1. For non permanent instance installations of the UPD will the printer be queried every
time? For cases where a user has chosen to create a permanent instance of a printer, settings
are permanently saved to the local registry (like any other printer driver) and the user would
continue to print to that permanently created instance. For cases where a user has not chosen to
create a permanent instance of a driver, registry entries are saved in a .CREG file (cached
registry). Initially the driver will attempt to save the CREG files to the "C:\Program Files\Hewlett-
Packard\HP Universal Printing" directory. If that directory is not available or is locked, the driver
will attempt to cache settings in the %TEMP% then %TMP% directories. If neither of these
directories are available then the HP Universal Print Driver will query the printer every time for
non-permanent instances.
ENWW Printer Automatic Configuration 77
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