Safari can’t open the page
what to do if a "can’t establish a secure connection to the server" message shows up on your mac safari?
MacBook Air 13″, macOS 10.15
The article posted in the thread is for Mac OS Yosemite , your profile shows using as Mac OS Catalina 10.15.
The network settings are weak and Mac can't connect to it Troubleshoot connecting your Mac to the internet - Apple Support
Recommended settings for Wi-Fi routers and access points - Apple Support
Troubleshoot external networking devices on Mac - Apple Support
If you can’t open a Safari window on Mac - Apple Support
Also you might be using anti virus , cleaners , softwares on the Mac if so uninstall all of them .
