146
Tr
ou
ble
sh
oo
tin
g
8
VPN communication cannot be
established
Q4
Symptom
▶
Cause
▶
Remedy
In the top page of the
“Basic configuration
page”, the message
“Communicating”
is not displayed for
the IPsec tunnel
connection.
Internet connection cannot be
established.
• Check whether the setting for Internet
connection has been configured.
• Troubleshoot according to the explanation
of “Q3 Internet connection cannot be
established” (page 144).
Communication cannot be
established with the destination
of IPsec connection.
Execute the ping command to the destination
IP address of IPsec, and check whether
a response is returned. If no response is
returned, check whether communication is
enabled in the destination device.
VPN communication
cannot be
established through
IPsec connection.
IPsec connection is not
established.
• Check whether the same pre-shared key
as the IPsec connection destination is
specified.
• Check whether the correct IP address and
correct name are specified in the method
used to identify the destination.
• Check whether the same authentication
algorithm and encryption algorithm as
the IPsec connection destination are
specified.
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 IPsec connection
is slow.
The Internet connection is slow.
Troubleshoot according to the explanation
of “Q3 Internet connection cannot be
established” (page 144).
L2TP/IPsec cannot
be configured for the
terminal.
The terminal does not support
L2TP/IPsec.
Prepare a terminal that supports L2TP/
IPsec. For the configuration procedure, refer
to the manual of the terminal.
