Users Guide

436 | Network-related Problems
When connection to a desired Web server fails
IPv4 and IPv6 Connection Problems
Unable to connect using an IPv4 address
Unable to connect using an IPv6 address
Cannot access the proxy server,
firewall, or Web server as a result of
access control.
The following types of access control are used. Confirm the
configured access control.
• Address (port) restriction
• SSL restriction
• User access restriction (including access right levels)
• Content block
• Scheme restriction (cannot use HTTP etc.)
• Transfer data size restriction
• Method restriction (cannot use POST etc.)
• HTTP header restriction (only accepting specified browsers etc.)
• Time restriction (only available during a specific period of time etc.)
Cause Remedy
Cause Remedy
The setting to use the proxy server
is not configured.
In the environment using the proxy server, you must configure the
machine to use the proxy server to connect to a desired Web server.
Make sure that you configure the settings to use the proxy server.
The setting to use a proxy server is
configured even though the
environment does not use a proxy
server.
In an environment that does not use a proxy server, such as when
connecting to an intranet, do not make the settings to use the proxy
server.
The proxy server address is
incorrect.
When the settings to use a proxy server are configured, you cannot
connect to a desired Web server if the IP address of the proxy server is
wrong. Set the correct IP address of the proxy server.
When the proxy server access
requires authentication, you
cannot connect to the server
because the user name or
password is incorrect.
Set the user name and password on the machine that allow
connection to the proxy server.
Symptom Remedy
When 0 (zero) is prepended to the
head of a value for the IPv4
address (for example: 192.0.2.010),
connection fails.
Do not prepend 0 (zero) to each value of an IPv4 address.
Symptom Remedy
You cannot connect to the
machine with the link-local
address.
When you specify the machine's link-local address, a scope ID must be
appended to the address.
For example, when you use Internet Explorer 11 on Windows 7 to
access the address "fe80::203:baff:fe48:9010", you must append the
Ethernet adapter local area connection number (for example, 8) for
Windows 7 to the address as follows: fe80::203:baff:fe48:9010%8