A. The VGW is not advertising the correct CIDR range back on-premises.
B. The instance security group does not allow ICMP traffic. Most Voted
C. A public virtual interface must be configured for Amazon EC2 connectivity.
D. The on-premises router is not advertising the correct CIDR range to AWS. Most Voted
E. There is a misconfiguration of the bi-directional forwarding detection.

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