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Troubleshooting (continued)
Symptom
Multicast images cannot be
played back
The frame rate of the
displayed image is low
A white zone appears in the
built-in viewer.
Unable to receive alarm
notification at the computer
via TCP/UDP
84
Causes and Countermeasures
● Start multicast transmission manually from the
Streaming page of VN-C215VP4U.
● In the case of multicast reception at the built-in
viewer, check that the multicast address and port
number of the built-in viewer settings coincide
with those on the Streaming page of VN-
C215VP4U.
Make use of a network that supports IGMPv2 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 on [Windows Firewall] in [Start]-
[Control Panel], click the [Add Port...] button
under the Exception tab, followed by
registering the port number in the port
number field, for which you want it to pass
through. Enter an arbitrary character string in
the name field.
● Check the settings on the Encoding page of the
VN-C215VP4U unit.
● Check the built-in viewer settings as well 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. Perform following on the Internet Explorer.
● Right-click on the Desktop screen. If -
[Properties]-[Setup]-[Advanced]-
[General]-[DPI Setting] is set to Large size
or Custom setting... , select Normal size
to resume normal drawing.
● Data may be blocked by WindowsXP firewall.
When this occurs, perform the following to allow
it to pass through.
● Double-click on [Windows Firewall] in [Start]-
[Control Panel], click the [Add Port...] button
under the Exception tab, followed by
registering the port number in the port
number field, for which you want it to pass
through. Enter an arbitrary character string in
the name field.
Reference
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