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Hi Ashutosh, the key here is in the fact that connectivity works when you reset the tunnel. Could you please check the negotiated phase 2 traffic selectors to confirm whether they allow connectivity between the VPC and on-prem IP addresses. It could be that the Cisco device is running a policy based VPN and is proposing multiple IPSec SAs (AWS is route based and supports only one IPSec SA at a time).
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