The scanner's date and time settings may be incorrect if power has not been supplied to the scanner for a long time.
When the scanner is connected using a client certificate for IPsec/IP filtering or IEEE802.1X, an error is indicated if a time lag occurs between the scanner's date and time and the validity period for the certificate. Because the scanner recognizes that the certificate is unavailable.
You can solve this problem by correcting the scanner's date and time settings. Connect the scanner and the computer using a USB cable, turn the scanner on, and then perform scanning over USB using Epson Scan 2. The scanner is synchronized with the computer and the date and time settings are corrected. The scanner indicates normal status.
If you cannot solve the problem, restore all network settings using the scanner's control panel. Connect the scanner and computer, make the network settings again, and then make the settings for client certification, IPsec/IP filtering, or IEEE802.1X.
When the IP address registered to the local address on Group Policy has been changed or cannot be used, IPsec communication cannot be performed.
Disable IPsec using the scanner's control panel.
If the DHCP is out of date, rebooting or the IPv6 address is out of date or has not been obtained, then the IP address registered for the scanner's Web Config (Network Security tab > IPsec/IP Filtering > Basic > Group Policy > Local Address (Scanner)) may not be found.
Use a static IP address.
When the IP address registered to the remote address on Group Policy has been changed or cannot be used, IPsec communication cannot be performed.
Disable IPsec using the scanner's control panel.
If the DHCP is out of date, rebooting or the IPv6 address is out of date or has not been obtained, then the IP address registered for the scanner's Web Config (Network Security tab > IPsec/IP Filtering > Basic > Group Policy > Remote Address(Host)) may not be found.
Use a static IP address.