Another firewall sits inside the PIX525, then out to the internet. A L2L VPN through the PIX525 hangs every few days and is recovered by rebooting the PIX525. The end peers report "IKE Responder: Remote party timeout - Retransmitting IKE request" and "IKE negotiation aborted due to timeout", the PIX525 reports "%PIX-6-110003: Routing failed to locate next hop for UDP from inside:a.b.c.9/500 to inside:[remote_peer]/500".
Note the "inside:[remote_peer" - this peer is actually outside and PIX525 even has static host route for it:
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...