I’m Gabriele Salati and i’m a 45 years old debian system adminitrator.
I have over 20 years of experience configuring linux internet services for private and corporate use.
I have always configured systems to use strong cryptographic criteria to defend beyond the authenticity of the interlocutors the secrecy of their conversations.
All of this is at the expense of backward compatibility with old, insecure and outdated applications.
In fact, if you can not connect, it is likely that you have to upgrade your software.