Windows Home Server, AWS, TLS 1.2 We don't have the lastest version.
What we did was disable the TLS 1.0 and 1.1 from windows server and that seems to have fixed the issue. We did not receive the alert from AWS the following month.
FYI, not sure if Home Server 2011 has TLS1.2 support so you may have to upgrade anyways.
Google disabling TLS 1.0 on windows server and it has some good documentation on how to do it.