You are attempting to establish a HA VPN to your on-premises network; however, the VPN connection is not establishing successfully. You have full administrative control over the Google Cloud networking environment and the on-premises firewalls that are acting as the VPN devices. The Google Cloud console shows "Negotiation failure" and "BGP is down". You check Cloud Logging by using a query for resource.type="vpn_gateway" and resource.labels.gateway_id="TUNNEL_ID_NUMBER". Logs Explorer shows frequent log entries: log name: …/logs/cloud.googleapis.com%2Fipsec_events" type: "vpn_gateway" textPayload: "received NO_PROPOSAL_CHOSEN notify, no CHILD_SA built" You need to troubleshoot the VPN failure and take corrective action based on the Cloud Logging entries. What should you do?
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