installation (and you know the HP device is on the network), or you have already
successfully installed HP software and experience problems, try the following:
1. If you are using a computer running Windows, in the firewall configuration utility,
look for an option to trust computers on the local subnet (sometimes called the
“scope“ or “zone“). By trusting all computers on the local subnet, computers and
devices in your home or office can communicate with each other while still being
protected from the internet. This is the easiest approach to use.
2. If you do not have the option to trust computers on the local subnet, add incoming
UDP port 427 to your firewall’s list of allowed ports.
NOTE: Not all firewalls require you to differentiate between incoming and
outgoing ports, but some do.
Another common problem is that HP software is not set as a trusted software by your
firewall to access the network. This can happen if you answered “block“ to any firewall
dialog boxes that appeared when you installed the HP software.
If this occurs, and if you are using a computer running Windows, check that the
following programs are in your firewall’s list of trusted applications; add any that are
missing.
• hpqkygrp.exe, located in C:\program files\HP\digital imaging\bin
• hpqscnvw.exe, located in C:\program files\HP\digital imaging\bin
- or -
hpiscnapp.exe, located in C:\program files\HP\digital imaging\bin
• hpqste08.exe, located in C:\program files\HP\digital imaging\bin
• hpqtra08.exe, located in C:\program files\HP\digital imaging\bin
• hpqthb08.exe, located in C:\program files\HP\digital imaging\bin
NOTE: Refer to your firewall documentation on how to configure the firewall port
settings and how to add HP files to the “trusted“ list.
Some firewalls continue to cause interference even after you disable them. If you
continue to have problems after configuring the firewall as described above and if
you are using a computer running Windows, you might need to uninstall the firewall
software in order to use the HP device over the network.
Advanced firewall information
The following ports are also used by your HP device and might need to be opened on
your firewall configuration. Incoming ports (UDP) are destination ports on the computer
while outgoing ports (TCP) are destination ports on the HP device.
• Incoming (UDP) ports: 137, 138, 161, 427
• Outgoing (TCP) ports: 137, 139, 427, 9100, 9220, 9500
The ports are used for the following functions:
Printing
• UDP ports: 427, 137, 161
• TCP port: 9100
Configure your firewall to work with HP devices 121
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