The error typically occurs when the GlobalProtect client cannot validate the certificate presented by the portal or gateway. This is a common security feature to prevent man-in-the-middle attacks.
To prevent future issues with the GlobalProtect VPN failed to verify certificate error, follow these best practices: globalprotect vpn failed to verify certificate
Delete files titled PanPortal* from ~/Library/Application Support/PaloAltoNetworks/GlobalProtect/ . GlobalProtect client trust store vs OS store mismatch
: The address you typed in the GlobalProtect app (e.g., ://company.com ) must exactly match the "Common Name" (CN) or "Subject Alternative Name" (SAN) listed on the server's certificate. For Administrators Verify Certificate Chain macOS : Go
: If these steps fail, it is likely a server-side issue that only your network administrator can resolve. For Administrators Verify Certificate Chain
: Go to System Preferences > Date & Time and ensure "Set date and time automatically" is checked. 2. Verify the Portal Address in a Browser