Access the scanner according to its MAC address using EpsonNet Config or Epson Device Admin from another computer, such as the administrator's. You can find the MAC address on the label pasted on the scanner.
If you can access, configure the IPsec/IP filtering settings using EpsonNet Config or Epson Device Admin.
If you cannot access, restore all network settings using the scanner's control panel. Connect the scanner and computer, configure the network settings again, and then configure the IPsec/IP filtering settings.