The error essentially means your computer does not trust the certificate being presented by the VPN gateway. This distrust can stem from several issues: the certificate might be expired, issued by an unknown authority, revoked, or there might be a mismatch between the certificate and the hostname.
sudo timedatectl set-ntp true sudo timedatectl status
Often, the client holds onto old connection data that conflicts with current network requirements. Clearing the cache forces the app to fetch fresh data.
If using public Wi-Fi (hotels/cafes), complete the "Login" page in a browser before connecting the VPN. ⚠️ A Note on Security If you see a "Continue Anyway"
Try these solutions in order. The first solution resolves nearly 50% of all "failed certificate" errors.
In corporate or educational networks (or even by third-party security software like AV or EDR), a proxy or firewall may be performing SSL decryption. This device intercepts the GlobalProtect traffic and presents its own certificate to the client. If the client does not explicitly trust the interception proxy’s CA certificate, the verification fails.
A common typo can cause a hostname mismatch. For example:
The most common cause is an expired SSL/TLS certificate on the GlobalProtect portal or gateway.
: Ensure the full CA certificate chain (Root + Intermediate) is imported onto the user's machine.
The error message can appear in the GlobalProtect log (often located in %PROGRAMDATA%\Palo Alto Networks\GlobalProtect\logs\PanGPHost.log on Windows or /var/log/paloaltonetworks/globalprotect/pan_gp.log on macOS/Linux) with variations like certificate verification failed , unable to get local issuer certificate , or certificate has expired . The root causes typically fall into four categories:
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The error essentially means your computer does not trust the certificate being presented by the VPN gateway. This distrust can stem from several issues: the certificate might be expired, issued by an unknown authority, revoked, or there might be a mismatch between the certificate and the hostname.
sudo timedatectl set-ntp true sudo timedatectl status globalprotect vpn failed to verify certificate
Often, the client holds onto old connection data that conflicts with current network requirements. Clearing the cache forces the app to fetch fresh data.
If using public Wi-Fi (hotels/cafes), complete the "Login" page in a browser before connecting the VPN. ⚠️ A Note on Security If you see a "Continue Anyway" The error essentially means your computer does not
Try these solutions in order. The first solution resolves nearly 50% of all "failed certificate" errors.
In corporate or educational networks (or even by third-party security software like AV or EDR), a proxy or firewall may be performing SSL decryption. This device intercepts the GlobalProtect traffic and presents its own certificate to the client. If the client does not explicitly trust the interception proxy’s CA certificate, the verification fails. Clearing the cache forces the app to fetch fresh data
A common typo can cause a hostname mismatch. For example:
The most common cause is an expired SSL/TLS certificate on the GlobalProtect portal or gateway.
: Ensure the full CA certificate chain (Root + Intermediate) is imported onto the user's machine.
The error message can appear in the GlobalProtect log (often located in %PROGRAMDATA%\Palo Alto Networks\GlobalProtect\logs\PanGPHost.log on Windows or /var/log/paloaltonetworks/globalprotect/pan_gp.log on macOS/Linux) with variations like certificate verification failed , unable to get local issuer certificate , or certificate has expired . The root causes typically fall into four categories: