This section describes the causes of network connection problems, and how to resolve them.

For explanations of messages that are not listed here, see "List of Error Messages."

[Confirm Network Connection Set. Changes] is set to 'Off'.

Set [Confirm Network Connection Set. Changes] to 'On'.

The machine and cable are not properly connected.

Turn OFF the machine's power switches, check that the machine is connected to the network using the proper cable, and then turn them ON. (See "Connecting the Machine to a Computer or Network.")

[Confirm Network Connection Set. Changes] is set to 'On', although the machine is not connected to a network.

Set [Confirm Network Connection Set. Changes] to 'Off'.

The machine periodically or temporarily communicates with devices on your network. If a dial-up router or NetWare file server is on the network to which the machine is connected, the machine connects to a destination other than the intended destination, depending on the settings of the machine or dial-up router. This may result in subscriber line charges and call charges.
Examples:

• The file or mail server's host name or IP address set on the machine does not exist on the network.

• The DNS server exists on an external network.

• You attempt to access a device connected to an external network, if the device's information is set on the DNS server on the network to which the machine is connected.

Check the following:

• If the dial-up router does not have to send packets via broadcast, change the router settings to ensure that it sends packets via a method other than broadcast. If dial-up router has to send packets via broadcast, check that the settings are correct.

• Check that the file or mail server's host name or IP address set on the machine is correct.

• If you attempt to access a device on the network to which the machine is connected, with the DNS server on an external network, set the destination using an IP address, not a host name.

• If information about a device on an external network is set on the DNS server on the network to which the machine is connected, check the settings.

Communication via the IP address of a computer on which you intend to use the Remote UI or utility is not permitted in [Firewall Settings] on the Network screen.

If communication via the IP address of the computer on which you intend to use the Remote UI or utility is not permitted in [Firewall Settings] on the Network screen, you cannot browse information pertaining to the machine or configure the settings. Configure [Firewall Settings] on the Network screen so that communication via the IP address of the computer on which you intend to use the Remote UI or utility is permitted. (See step 8 in "TCP/IPv4 Settings," or step 6 in "TCP/IPv6 Settings.")

[Dedicated Comm. Settings] or [Dedicated Port Settings] is set to 'Off'.

See "Communication Environment Setup" and specify the following settings:

• Set <Use SNMP v.1> to 'On' → select [Dedicated Comm. Settings] → set <Dedicated Community> to 'On' → select [Read/Write] in <MIB Access Permission>.

• Set [Dedicated Port Settings] to 'Off'.

The SNMP community name does not match.

If you use an SNMP community name different from the one stored in the machine to access the machine from a utility, the utility will not detect the machine. In this case, check the SNMP community name. (See "Communication Environment Setup.")

Invalid cache data is remaining.

If the Remote UI does not start properly and an error message is displayed on your Web browser, delete the cache files.

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