Fujitsu fi-6000NS Operator's Manual page 116

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If connection to LDAP server is not possible, try the following steps:
1. Disconnect the LAN cable and turn the scanner off.
2. Reboot the scanner with the LAN cable still disconnected, and enter
a nonduplicate IP address.
3. Re-connect the LAN cable to the scanner.
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If the DHCP server cannot be reached when DHCP is set to [On], the IP
Address is set to "169.254.XXX.YYY" (where XXX and YYY are arbitrary
values between 0 and 255).
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If the status of the network connection is correct but the network is not
communicating properly, change the [Link Speed/Duplex Mode] from
"Auto-Negotiation" to a fixed mode.