Panasonic FP Web-Server2 Hardware And Configuration Manual page 190

try the following:
FP Web-Server V2.810 EN
a. Disable the Windows firewall on your LAN connection
For this go to "Settings / Network connections" and open the properties
of the Ethernet/LAN card. Under "Advanced" disable the firewall
function.
b. If [Send] or [Send File] does not work
You receive an error message: "The computer is disconnected from the
network". Start the Internet Explorer, open "File" menu and remove the
checkmark at "Work Offline".
Additional information
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