Unable to access website for school

https://banserv2.douglas.bc.ca/prod/twbkwbis.P_WWWLogin

I cannot access this website using my laptop and I've tried everything.

Someone please help me. I am able to access this website using another device such as my phone or my classmate's PC.

Here are some of the things I've tried.

• Clear browser cache and cookies
• Tried using Safari, Firefox and Chrome
• Changing DNS settings to Google's 8.8.8.8
• Flush DNS
• Disable IPv6
• Laptop date/time is correct
• I don't have an anti-virus

Here's the error message I get on Safari: "Safari Can't Open the Page: Cannot establish a secure connection to the server"

Chrome: "This site can't be reached. banserv2.douglas.bc.ca/ unexpected closed the connection"