Network Related Problems
187
Problem Solving
11
Unable to Connect to the Desired Web Server
The setting 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 connected server or proxy
server is down.
Check whether the server or proxy server to connect to is
working normally.
A network cable is
disconnected or broken.
Check the network cable connections. The use of a spanning
tree environment is recommended to create a network
environment resistant to disconnections.
Unable to communicate due to
the load on the server
application.
Wait a while, and then access the server again.
An error has occurred but is not
displayed on the control panel.
Errors that occur while executing background processes are not
displayed on the control panel. Print the Job History Report to
check the execution results.
Unable to connect due to an
access restriction set in the
proxy server, firewall or web
server.
Types of access restrictions are listed below. Check the set
access restriction.
z
Address (port) restriction
z
SSL restriction
z
User access (or access authority level) restriction
z
Content block
z
Scheme restriction (such as restriction on use of HTTP)
z
Forwarded data size restriction
z
Method restriction (such as restriction on use of POST)
z
HTTP header restriction (such as access permitted only on
certain browsers)
z
Time restriction (such as use permitted only during certain
time slots)
Symptom Remedy
The machine is not set to use a
proxy server.
If the machine is not set to use a proxy server in an environment
that uses one, you cannot connect to the desired web server. Set
the machine to use a proxy server.
The machine is set to use a
proxy server even though the
environment does not use a
proxy server.
Do not set the machine to use a proxy server in an environment
not requiring the use of the proxy server (such as an intranet).
The proxy server address has
not been set correctly.
If the machine is set to use a proxy server, you will not be able to
connect to the desired web server if the proxy server address is
not set correctly. Set the proxy server address correctly.
Unable to connect because the
user name or password is
incorrect when the proxy server
requires authentication.
Set a user name and password in the machine that the proxy
server will permit connection for.
Possible Cause Remedy
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