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Hi,
I would start by identifying the source of the calls (to S3, SES, etc) and then review the host configuration. You may have to upgrade your OS, upgrade .Net if using .Net, enable TLS1.2, upgrade the AWS SDK...
Our blog post is a good starting point to get started. We also have other references I am including below, hopefully it helps getting started:
[1] Enabling TLS 1.2 EC2 Windows Server 2012 to 2022: https://repost.aws/articles/ARZhgX8RY2Qm6KL1IDpkMv_g/enabling-tls-1-2-client-side-support-on-ec2-windows-server-2012-to-2022
[2] Continued support of TLS 1.0/1.1 for my S3 buckets: https://repost.aws/knowledge-center/s3-access-old-tls
[3] Enforcing TLS 1.2 for S3: https://repost.aws/knowledge-center/s3-enforce-modern-tls
[4] How do I find the SMTP clients using deprecated TLS versions?: https://repost.aws/articles/ARpq6we7zwQNCbkGL5IhAarg/how-do-i-find-the-smtp-clients-using-deprecated-tls-versions
[5] How do I find IP addresses of SMTP Clients behind a NAT gateway?: https://repost.aws/articles/ARevUPGDKvRyant5D1MA7yZg/how-do-i-find-ip-addresses-of-smtp-clients-behind-a-nat-gateway
Please note the deadline was June 28, 2023 and our service teams have been gradually rolling out to changes to all endpoints since that date.
Please refer to this article here: https://aws.amazon.com/jp/blogs/security/tls-1-2-required-for-aws-endpoints/
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Could you add the AWS SDK version you are using?