On May 30th we will be migrating our Sync server fleet to a new TLS configuration to match the Firefox Accounts recent change. That policy is described here under 2016-08: https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-security-policy-table.html .
Though we are dropping a number of currently supported ciphers and the SSLv3 protocol, we do not expect this change to disrupt any currently active users. Those items being dropped are no longer supported by Firefox Accounts (which fronts the authentication for Sync), and therefore supporting them only serves to lower the overall security profile of the service. Essentially, if you can connect to Firefox Accounts now you'll be able to continue to connect to Sync. Regards, Bob M.
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