We're having trouble troubleshooting the site to site with Fortinet and ASA. Our firewall is ASA ASA5525.
Few days ago we observed that the tunnel very often to went down, even we refreshed the tunnel it won't bring up.
And we need to initiate a traffic behind of our firewall ASA to lan (Tx Increment while Rx doens't increment) to behind of fortinet, after it a few seconds the tunnel will goes up.
As follows is our phase 1 policy
crypto ikev1 policy 1
I would like to understand why the tunnel always went down and we need to initiate a traffic behind us? and
We don't see any problem with other site to site.
(Tx Increment while Rx doens't increment) As we initiate we're sending traffic that's why Tx incremented and why we're not receiving it? the fortinet doesn't responding to us? (that's why the Rx doesn't incrementing) and after the initiating from us ASA proposed a policy 1 the tunnel will goes up again?