We have 6 tunnels to AWS (pair of 2). Each tunnel has it's backup tunnel to AWS. On 14.53 version we have all 6 tunnels up and running with IKEv1 but when we switchover to 15.42 and 15.44 we encountered same issue. Only 1 tunnel is staying up and backup tunnel is not coming up. On 15.42 and 15.44 we were using IKEv1 too.
Does anyone using AWS with IKEv2 on 15.xx version ?