Network-related Problems
169
Problem Solving
11
IPv4 and IPv6 Connection Problems
The possible causes and remedies for problems when using an IPv4 or IPv6 address
are as follows:
Unable to connect using an IPv4 address
The address of the address that
does not use a proxy server is
incorrect.
Confirm whether only addresses that do not use a proxy
server are set. Even if addresses not through a proxy
server are specified using the FQDN, if a server is directly
accessed using its IP address, the registered server is
not excluded. Set the address not to use a proxy server.
Likewise, even if you directly specify an address that
does not use a proxy server, if a server is accessed with
the FQDN, the registered server is not excluded. Set an
IP address with the FQDN not to use a proxy server.
The desired server, or the proxy
server is down.
Confirm whether the desired server or the proxy server is
operating correctly.
The network cable is not
connected, or broken.
Confirm whether the network cable is correctly
connected. We recommend using a spanning-tree
configuration, with which network disconnection rarely
occurs.
Cannot communicate because of
overloading of the server
application.
Wait for a while and try accessing again.
An error occurs that is not
displayed on the touch screen.
Even though an error occurs during background
processing, no message appears on the touch screen.
Display the [Jobs] screen or print the Job History Report
to confirm the result.
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.)
Symptom Remedy
When 0 (zero) is added to the
head of a value for the IPv4
address (for
example:192.0.2.010),
connection fails.
Do not add 0 (zero) to each value of an IPv4 address.
Cause Remedy