Is a HTTPS connection secure without a valid SSL certificate?

Question

I use a HTTPS connection without a valid SSL certificate. Is the connection safe? Is the information encrypted?

Answer 1

Don't bother yourself anymore with invalid ssl certificate. You can now generate free browser valid certificate for your server as easily as you would generate a snakeoil (self-signed, browser invalid) certificate. Go see https://letsencrypt.org/ it's free and open to contributions.