Installation/Settings Problems
See Common Problems also.
Problem with the LAN Connection
Remote UI is not displayed.
Are <Use HTTP> and <Use Remote UI> set to <On>?
Check whether the LAN cable is connected properly and the IP address is set correctly, and then start the Remote UI again.
Are you using a proxy server? If you are using a proxy server, open the Proxy Settings dialog box of the Web browser, and add the IP address of the machine to the Exceptions section. (Do not use a proxy server for addresses beginning with a colon.)
Is the computer communication restricted by a firewall? In this case, set the Address Filter to <Off>.
The indicators of the LAN port are off.
Use a straight-through Ethernet cable for the LAN connection.
Check that the hub or router is turned ON.
Do not connect the cable to the UP-LINK (cascade) port of the hub.
Change the LAN cable.
A connection to a network cannot be established.
The IP address may not be set correctly. Set the IP address again.
The IP address assigned automatically may have failed. Specify a fixed IP address.
The IEEE 802.1X settings may not be correct. Press 
(Status Monitor) 
<Network Information> 
<IEEE 802.1X Error Info> check the error status. For more information about the IEEE 802.1X settings, see Configuring IEEE 802.1X Authentication.
(Status Monitor) <Network Information> <IEEE 802.1X Error Info> check the error status. For more information about the IEEE 802.1X settings, see Configuring IEEE 802.1X Authentication.You are unsure of the set IP address.
A fax cannot be sent or received on an optical fiber line.
This machine conforms to an analog telephone line standard. The machine can be connected to the public switched telephone network (PSTN) only. If you connect the machine to a digital telephone line or a dedicated telephone line, it might impede proper operation of the machine and could be the cause of damage. Make sure to confirm a type of telephone line before connecting the machine. Contact your optical fiber line or IP telephone line service providers if you want to connect the machine to those telephone lines.
The machine dials up to an unintended connection destination (if a dialup router is connected to a network).
If a dialup router does not need to pass broadcast packets, set the dialup router so that the broadcast packets will not pass. If the dialup router needs to pass broadcast packets, check whether the settings are correct.
If a DNS server is located in an external network, set the IP address to be connected, not the host name, even if connecting to the devices that are on the network that is connected to the machine.
If a DNS server is located on a network that is connected to the machine and the information about the devices that are connected to an external network is registered to the DNS server, check whether the settings are correct.
Problem with the USB Connection
The machine cannot communicate.
Is the USB connection with the computer restricted?
Change the USB cable. Replace the USB cable with a shorter one if it is long.
When you are using a USB hub, directly connect the machine and the computer by using the USB cable.
When using the machine with a USB connection, be sure to match the machine settings to the OS of the computer.
Problem via the Print Server
The print server to connect is not found.
Are the print server and the computer connected correctly?
Is the print server active?
Are you authorized to connect to the print server? If you have any questions, contact your Server Administrator.
Is [Network discovery] turned ON? (Windows Vista/7/8/8.1/Server 2008/Server 2012)
Shared printer cannot be connected.
Are the printers connected to the print server displayed on the network configuration page? If the printers are not displayed, contact your Network or Server Administrator.