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HTTPS broken after upgrade to 15.3.1 (from 15.3.0)

I have Snap and upgrade our FTP server yesterday from 15.3.0 to 15.3.1

now https is no more working.

This site can’t provide a secure connection uses an unsupported protocol.

view certificate is fine and valid.
any idea ?
Parents Reply
  • Thanks , yes I did that exact check and SSL Labs simply said it could not connect. Think by default TLS1.1 is no longer supported in 15.3.1 so I wonder if certain certificates if they are old dont have capability to work with TLS1.2 or 1.3, seems odd but thats the only explanation I could think of?