On Windows computers, Net3 products (including Consoles, Gateway
Configuration Editor, and Concert) all use a background service called "SLP"
(Service Location Protocol) to discover other devices on the network.
A variety of problems can cause SLP to be unable to discover devices, which
will appear as devices not showing up in the software you are using. Some
troubleshooting possibilities are shown here.
Some HP printer driver software may block the network port required for SLP
to run, leading it to appear not to work. You can disable the HP printer
software in question by:
1. Hold the Windows key and press R, then type services.msc to open the
services control panel
2. Scroll down and look for a service called "HP Network Devices Support"
3. Double click on the service, and change the Startup type to Disabled, and
press Stop to stop the service.
4. Press OK, and restart the ETC application you are trying to use. You
should now be able to connect.
Note : You will need to re-enable the service to discover HP printers.
ETC Technical Services has seen a few other manufacturers using some
proprietary SLP implementations that don't seem to share their discovery data
with other applications.
These situations are always a bit of an adventure -- spelunking through the
system to discover the program grabbing the SLP network port and denying
access to Net3 applications.
Microsoft Sysinternals has a software program called TCPView that
shows what processes are using what network ports. If you run that program and
look for things using port 427, you'll likely find the culprit. If it is a
service, you can follow steps like described above to stop and disable the
offender. If it is an individual runtime application, close it via whatever
programmatic mechanism is appropriate.
Additional services to be aware of that can block SLP include Brother and
Epson network printer services.
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