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Symptom
Multicast images cannot be
played back
The frame rate of the
displayed image is low
A white zone appears in Built-
in Viewer
A warning message appears
upon starting up Built-in
Viewer
Causes and Countermeasures
● Start multicast transmission manually from the
[Streaming] page of VN-V686WPU.
● In the case of multicast reception at Built-in Viewer,
check that the multicast address and port number
of Built-in Viewer settings coincide with those on
the [Streaming] page of VN-V686WPU.
Make use of a network that supports IGMP v2 for
multicast transmission.
● Multicast may be blocked by the WindowsXP
firewall. When this occurs, perform the following to
allow it to pass through.
Double-click [Windows Firewall] under [Start]-
[Control Panel], click the [Add Port...] button
under the Exception tab, and register the port
number to be allowed through the firewall in the
Port Number field. Enter an arbitrary character
string in the name field.
● Check Built-in Viewer settings when a Built-in
Viewer is in use.
● Frame rate will be constrained when the network
bandwidth is narrow.
For some computers, a part of the Internet Explorer
graphics may not appear and is left white when the
following setting is performed on the Internet
Explorer.
If [Right-click on the Desktop screen]-[Properties]-
[Settings]-[Advanced]-[Advanced]-[DPI setting] is
set to Large size or Custom size , select
Normal size(96DPI) to resume normal drawing.
Built-in Viewer consists of a software component
called ActiveX.
The ActiveX is usually installed when Built-in Viewer
is used for the first time. However, installation may
be rejected depending on the Anti-virus software
settings. In this case, change the settings of the
Anti-virus software before installing Built-in Viewer.
Reference
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