150
Tr
ou
ble
sh
oo
tin
g
8
Symptom
▶
Cause
▶
Remedy
VPN communication
cannot be
established
through IPIP tunnel
connection.
IPIP tunnel connection is not
established.
• Check whether the IP address issued for
the destination by the closed network is
correctly specified in the destination IP
address.
• In the “Basic configuration page”, select
“Advanced settings” - “Configure VPN
connection”. In the setting screen for
IPIP tunnel connection, check whether
the interface used for connection with the
closed network is selected for “Connection
provider”.
Incorrect routing information has
been configured.
Configure the correct destination LAN
network address for the routing information.
The setting is not correct in the PC
connected to the destination LAN.
• Check the setting of the application
software used for communication.
• If the Firewall function is enabled in the
PC, change the Firewall setting so as not
to block packets used for communication.
In Windows 7, on the screen that appears
by clicking “Start” - “Help and Support”,
enter “Firewall” in the search field, and
carry out a search. Relevant information
is displayed. Troubleshoot according to
the instruction.
The VPN
communication
of the IPIP tunnel
connection is slow.
The closed network connection
is slow.
Contact the carrier regarding problems with
line condition.
Windows files cannot
be shared.
Filter to NetBIOS traffics is
enabled.
Click “Advanced settings” - “Configure
firewall” screen, click “Configure” for the IPv4
filter of the LAN port. In the “Configure IPv4
firewall” screen, clear the check box for the
filter of NetBIOS traffics in “IPv4 static IP filter
list”, and then click “Submit”.
VPN communication cannot be established
(Continued from the previous page)
Q4
