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 ?
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  • Same. I'm also waiting for some additional feedback from the forum before we install. I already entered a ticket for clarity on "Removal of DSA 2048 and 4096 SSH private keys" just to ensure that won't impact any partners using DSA keys connecting to us. I'm pretty sure it won't but better safe than sorry.