Safari shows "secure connection" error when it can't verify encrypted data. Error occurs when website lacks proper SSL certificate configuration. Common on popular sites like Facebook, YouTube, and Google
Check system clock settings and update if error occurs only on one computer. Delete non-Apple invalid SSL certificates in Keychain Access. Opt out of all beta programs in Steam settings
NET::ERR_CERT_AUTHORITY_INVALID is a browser warning about certificate validity issues. Error doesn't indicate site risk but indicates potential security problems. Common variations include NET::ERR_CERT_TRANSPARENCY_REQUIRED and NET::ERR_CERT_DATE_INVALID
Browser cannot confirm website safety before loading. Error prevents visiting sites without antivirus protection. Digital certificates verify site legitimacy and protect personal data
Server issues can prevent website access. Corrupt browser data and cookies may trigger the error. Expired SSL certificates can cause problems
Safari displays "Can't Establish Secure Connection" when SSL certificate issues occur. Error prevents secure website access and online transactions