blocks many ports and services, including remote administration. The procedure for enabling
remote WMI calls is outlined in a Microsoft Developer Network (MSDN) technical note titled
Connecting through Windows Firewall. Run the following command at a remote client to allow
remote administration using WMI:
netsh firewall set service RemoteAdmin enable
Windows XP SP2 includes a built-in firewall that is enabled by default to minimize the chance of
attacks on a machine. This firewall can cause access-denied errors when the remote computer
and the accounts used for remote connections are not properly configured. When obtaining data
from a remote machine, WMI must establish a Distributed Component Object Model (DCOM)
connection from local computer to remote computer. To establish this connection, both Windows
Firewall and DCOM on the remote computer must be configured correctly to avoid access-denied
errors. The configuration must be done locally on the remote machine by changing Group Policy
settings, executing NETSH commands, or executing a script.
PERFORMANCE
WMI interrogations can be intensive on some workstations. If WMI discoveries take too long to
complete, use the following steps to help speed up the discoveries:
1. Enabling WMI on the client’s firewall is not sufficient for good performance. While the WMI
resolver eventually resolves the device, Windows spends large amounts of time trying to find an
enabled communication protocol. Disable the client’s firewall altogether to greatly improve WMI
performance.
2. After the authorized administrative user’s profile is loaded into the PC client, the WMI resolver
can obtain device information from the remote PC fairly quickly after it attempts to determine if
HP SNMP Proxy Agent is installed. If it is known that HP SNMP Proxy Agent is not installed on
any workstation, which prevents HP Web Jetadmin from attempting to discover devices, the WMI
resolver can save several seconds per workstation. To skip the HP SNMP Proxy Agent resolver
step during discoveries, open a text editor and paste the following text into the file:
<ipmc:configuration xmlns:ipmc="www.hp.com/schemas/imaging/ipmc/config/2004/02/24
">
<property name="SkipProxy">
<type>HP.Imaging.Wjp.Sdk.Core.Framework.ConfigurationItemString</type>
<value>yes</value>
</property>
</ipmc:configuration>
3. Save the file and place it in the following directory:
C:\Documents and Settings\NetworkService\Local Settings\Application Data\HP
Inc\HPWebJetadmin\WjaService\config\ResolverMethodPC.config.xml
4. Restart the HP Web Jetadmin service (HPWJA Service).
SUMMARY
HP Web Jetadmin provides two separate techniques for remotely discovering PC-connected devices.
These techniques eliminate the need for physical inventories and provide administrators with the
flexibility to choose an appropriate tactic. Each technique has advantages and disadvantages.
However, proxy agents are generally the preferred method because they provide better management
capabilities for PC-connected devices.
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