Access the scanner according to its MAC address using EpsonNet Config or Epson Device Admin from another computer, such as administrator's. You can find the MAC address on the label pasted on the scanner.
If you can access, make 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, make the network settings again, and then make the IPsec/IP filtering settings.