16 Problem Solving
170
Problem Solving
16
When connection to a desired Web server fails
The network cable is not
connected, or broken.
Check if the network cable is properly connected. We
recommend spanning-tree configuration, with which network
disconnection rarely occurs.
Communication cannot be
established due to
overloading of the server
application.
Wait for a while and try to access again.
An error occurs that is not
displayed on the control
panel.
When an error occurs while a background processing is
running, no massage appears on the control panel. Display
the [Job Status] screen, or print the job history report to
confirm the result.
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.
Cause Remedy
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