SSL stands for Secure Sockets Layer which is a protocol to securely connect to a web server. Nowadays, Chrome insists a SSL certificate for all websites that collect data from users. Most probable reason for this error is incorrect configuration at server side that the data received is not understandable by Chrome. Sometimes the error also occurs due to the blocking and firewall on your computer.
Check the following:
- Open other webpages
- Check proxy settings if you have and
- firewall settings if you have Windows PC
If everything is working fine from your end then the error is at the web server which you can’t influence.