Network-related Problems
393
Problem Solving
14
When connection to a desired Web server fails
IPv4 and IPv6 Connection Problems
This section describes symptoms and remedies for errors that may occur when an IPv4
or IPv6 address is used for connection.
Unable to connect using an IPv4 address
Cannot access to the proxy
server, firewall, or a Web
server due to its access
control.
The following types of access control are used. Confirm the
configured access control.
z
Address (port) restriction
z
SSL restriction
z
User access restriction (including access right levels)
z
Content block
z
Scheme restriction (cannot use HTTP etc.)
z
Transfer data size restriction
z
Method restriction (cannot use POST etc.)
z
HTTP header restriction (only accepting a specified
browser etc.)
z
Time restriction (only available during a specific period of
time etc.)
Cause Remedy
The settings to use the proxy
server is not configured.
In the environment using the proxy server, the machine
should be configured to use the proxy server. Otherwise, you
cannot connect to a desired Web server. Make the settings
to use the proxy server.
The settings to use the proxy
server is configured even
though the environment does
not go through the proxy
server.
In the environment that does not use the proxy server such
as 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 the proxy server are configured,
you cannot connect to a desired Web server unless the IP
address of the proxy server is correct. Set the correct IP
address of the proxy server.
When the proxy server
requires authentication,
cannot connect to the server
because the user name or
password is incorrect.
Set the user name and password to the machine that are
allowed to connect to the proxy server.
Symptom Remedy
When 0 (zero) is prepended
to the head of a value,
connection fails. (Example:
124.249.010.033)
Do not prepend 0 (zero) to each value of an IPv4 address.
Cause Remedy