Lan port can not be pinged when IP Sec is enabled

  • I am running PFSense 2.2.5 on Dell hardware but have some weird issue with IPSec and connectivity to the LAN interface. When IPSec is enabled I can not ping the LAN interface. I can ping a desktop behind this firewal from a site behind the IPSec tunnel. However I can not ping the desktop from the firewall or from another local LAN interface on the firewal.
    When I connect to the desktop and ping the firewall and do a tcpdump on the firewall. I see the icmp packets arrive on but never being replied on the interface.

    When I disable IPSec I can ping the firewall without problem.