ITS101 Installation Manual
7.2.2. OpenVPN
Once an OpenVPN server has been established with the creation of the relevant certificates,
keys and configuration files, the most common fault is that a path to the client or server
cannot be established. This fault relates to both the physical hardware of the network and
software/embedded firewalls.
When building an OpenVPN server it is advisable to start with a very simple network, such as a
direct LAN connection to the unit, and then progress to a system working over the internet.
This will allow you to identify problem elements in your network in a systematic manner.
Initially, establish a connection with no firewalls in place. This verifies that the OpenVPN
specific files such as the configuration files, certificates and keys are correct. At this point you
should also ensure that the unit's time settings are correct as a time discrepancy between the
server and the unit can result in the connection being refused by the server.
Once this connection has been established and it is possible to transmit and receive data, the
server can be considered functional.
The next step introduces the main software element that can impede connection, the firewall.
Firewalls can be a particular hazard for the connection of an OpenVPN system. If connection is
not possible after the firewall is implemented you will need to open up the OpenVPN socket (as
defined in the server configuration file) and allow access for the OpenVPN executable. You will
need to refer to the user manual for your operating system for instructions on how to do this.
The third step introduces the system to the internet, again you may find that your hardware
has some form of firewall that impedes the OpenVPN connection. You should refer to the
manufacturers user manual for instructions on how to enable the connection.
7.3. ANPR problems
Via the ANPR viewer (Intrada graphical user interface, a Windows application) - connecting via
Ethernet - the currently captured images together with recognition results can be inspected.
There may be a few reasons why the ANPR does not function as expected.
7.3.1. Dirty camera
Cameras placed by the roadside are subject to spray from the vehicles that pass them, over
time this can lead to the camera front becoming dirty. This impairs data recognition. As such
you will need to clean the camera front at regular intervals.
7.3.2. Incorrect camera placement
Ensure that the camera is situated in such a way that the maximum horizontal and vertical
capture angles are not exceeded. THe maximum angles are 40 degrees. The smaller the angle,
the better results are obtained.
Ensure that the plates are being captured at the cameras specified capture distance and are of
the correct size in the field of view. The plate width should be in the order of between 1/4
th
to
1/8
th
of the image width.
Ensure that plate tilt is not excessive. Ensure that no objects have been placed in front of the
camera.
ARVOO Imaging Products B.V. page 31 of 33
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