Resolution (Assumption is the URL is not working on all the browsers)
a) Check if the SSL Certificate has got installed properly. Use our SSL Installation Checker.
b) Check if the correct URL is been typed to access the website.
c) Check if the public matches with the private key installed on the server.
d) Please confirm with the network team whether the port for configured for this website is open and configured to accept https request.
Please raise a support ticket with us and we will help you understanding the issue.