Check the exact URL you are using in the GlobalProtect client. If your IT department gave you gp.mycompany.com , ensure you didn't type gp.my-company.com . A single character mismatch triggers the error.
Symptoms: browser shows “incomplete chain” even though client has root CA. Fix: globalprotect vpn failed to verify certificate
: If your computer's date/time is wrong, it may incorrectly flag a valid certificate as expired or not yet valid. How to Fix: Troubleshooting Steps 1. Check Your Device's Date and Time Check the exact URL you are using in
Symptoms: certificate subject/Common Name or SAN does not match gateway hostname you connected to. Fix: Check Your Device's Date and Time Symptoms: certificate
: Disable any third-party proxy or "web protection" software (like antivirus HTTPS scanning) that might be intercepting the connection with its own certificate. Troubleshooting for Administrators
You are not alone. This is one of the most common yet perplexing errors encountered by remote workers using Palo Alto Networks' GlobalProtect VPN. The error is a security feature, not a bug—it means your computer and the VPN gateway cannot establish a trusted, encrypted handshake. However, understanding why it happens and how to fix it is the key to getting back online.