Fujitsu fi-6000NS Operator's Manual page 188

The network interface connection will be lost when the scanner is restarted
HINT
to complete the restoration of the system settings. To continue with other
settings, wait a short time for the device to restart, then login to the net-
work interface again.
As the network interface connection to the scanner requires the IP
address or scanner name, if this is changed by the restoration of the sys-
tem settings (i.e. if the backed up IP address or scanner name is different
to the pre-restoration IP address or scanner name), the new IP address or
scanner name will be needed. If not known, the current state of these set-
tings can always be checked by physically logging in to the scanner via the
touch panel interface.
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