Hi All
We have around 90 vpn tunnels terminating on a 600C device. Devices on other end are all fortinets. The software versions of 600C is 5.2.4 and all other fortinets connecting to 600C are version 5.2.9. All VPN tunnels are flapping at particular time stamps, not all time.
My initial suspect was if fortiguard uses port 53 instead of port 8888, outbound connections might flap (not sure of this..just read in one kb article)
Any ideas of why is this happening? Software version mismatch or any other?
Any help is much appreciated!!!
