This is about openssl configuration in Ubuntu. In the latest Ubuntu, they disabled TLS 1.0/1.1.

So to enable it back there is a workaround (taken from StackOverflow):

You should modify openssl config: /etc/ssl/openssl.cnf

You need to add this to the beginning of your config file:

openssl_conf = default_conf

And then this to the end:

[ default_conf ]

ssl_conf = ssl_sect

[ssl_sect]

system_default = ssl_default_sect

[ssl_default_sect]
MinProtocol = None
CipherString = DEFAULT:@SECLEVEL=1