Aqua Data studio postgresql ssl

In your Server Registration dialog, in the Driver tab you can enter the 
parameter value of:

?ssl=true;sslfactory=org.postgresql.ssl.NonValidatingFactory

This will tell the driver to enable SSL and to use the NonValidatingFactory.  
The documentation for the NonValidatingFactory is :
"Provide a SSLSocketFactory that allows SSL connections to be made without validating the server's certificate. This is more convenient for some applications, but is less secure as it allows "man in the middle" attacks."

Do note that the "ssl" and the "sslfactory" options are separated by ";" and not "&".