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Here are some things to validate.
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Ensure that you have disabled the Source/Dest check on the instance where you are running the VPN. Instructions to do this are available here. https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck
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Check that your Security Group on the VPN instance allows inbound traffic (probably All Traffic) for the CIDRs in the data center.
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Enable flowlogs on the VPC (at least temporarily) and validate if your are seeing REJECTs on the VPN instance.
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Thanks very much. The first suggestion (Source/Dest check) worked.