Fix AWS Site-to-Site VPN -- 2

Job ID: 40401918

Budget: $15 – $25 USD

I have an existing Site-to-Site VPN between my on-prem network and an AWS VPC that is no longer behaving as expected. The tunnel comes up intermittently and drops traffic after a short period, so something in the current configuration—or a recent AWS update—appears to be off.

I have already verified that my on-prem router is reachable and that the customer gateway details on both ends still match, but the logs point to Phase 1 re-negotiations looping. I would like an experienced AWS networking specialist to jump in, review the current setup (VPC route tables, security groups, tunnel options, pre-shared keys, IKE version, etc.), identify the root cause, and restore a stable, continuous connection.

Deliverables should include:
• A working, persistent Site-to-Site VPN tunnel with bidirectional traffic flowing normally
• A brief summary of the changes you made or recommended so I can document the solution for future reference

If you need temporary IAM access or specific logs, let me know and I will provide them. I am ready to start as soon as you are.