TLS changes for upgrade.yubico.com
2017-07-17
https://upgrade.yubico.com is now using Let’s Encrypt TLS certificates.
Changes to the web server’s TLS configuration has been made as well, in particular, only supporting the TLSv1.2 protocol and dropping support for 3DES ciphers.
All modern web clients should continue to work as normal.
Yubico Server Status 
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