I am trying to establish OSPF between two Cisco routers and an HA configured pair of Checkpoint firewalls the reside on the same LAN segment. The two routers form a good adjacency, but the routers will not form an adjacency to the Checkpoints. The neighbor status shows exstart/drother, then go down, then back to exstart/drother. We have verified the MTU sizes and hello, dead, wait and retransmit times are the same. I am showing sent and received packets from the Checkpoints. Has anyone had this issue?