Hello Guys!

Someone, can help me with this scenario? Google this time was not enough...
Primary link is R1 -> R3 -> R2
NAT failover working perfect thanks to ip sla and track
VPN site-to-site working ok through primary link.
When R3 goes down, all traffic switch to R4 but VPN seems to freeze.
The session status are UP-ACTIVE on both routers.

R1#sh cry session
Crypto session current status
Interface: Serial0/1
Session status: UP-ACTIVE
Peer: 20.20.20.1 port 500
IKE SA: local 10.10.10.1/500 remote 20.20.20.1/500 Active
IPSEC FLOW: permit ip 192.168.10.0/255.255.255.0 192.168.20.0/255.255.255.0
Active SAs: 2, origin: crypto map
Interface: Serial0/2
Session status: UP-ACTIVE
Peer: 40.40.40.1 port 500
IKE SA: local 30.30.30.1/500 remote 40.40.40.1/500 Active
IPSEC FLOW: permit ip 192.168.10.0/255.255.255.0 192.168.20.0/255.255.255.0
Active SAs: 2, origin: crypto map
THANKS!