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Hi,
Yes, upgrade to TLS 1.2 is now enforced: see https://aws.amazon.com/blogs/security/tls-1-2-required-for-aws-endpoints/
So, you must upgrade your LB and/or webserver so that they work at this newer version of TLS. You application code should remain unchanged.
I don't know all details of your Tomcat config, but usually you enforce TLS v1.2 with -Dhttps.protocols=TLSv1.2
as a config parameter of your setenv.sh script
Best,
Didier
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