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Why is IPsec/Phase 2 for AWS Site-to-Site VPN failing to establish a connection?

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IPsec/Phase 2 fails when I set up an AWS Site-to-Site Virtual Private Network (VPN) connection. I want to troubleshoot this error.

Resolution

If an Internet Protocol security (IPsec/Phase 2) connection fails, then complete the following:

Related information

Example customer gateway device configurations for dynamic routing (BGP)

Example customer gateway device configurations for static routing

Modify Site-to-Site VPN tunnel options

What is AWS Site-to-Site VPN?

AWS OFFICIAL
AWS OFFICIALUpdated 3 months ago