This is a known vendor error and until a fix is provided, the workaround to this issue is to open task manager and end the “Global-protect client” app, or to restart your computer.
User Impact: Users may encounter a blank login page when attempting to connect to VPN via GlobalProtect.
Current Status: Technicians are working with the vendor to fix the error in an upcoming update. In the meantime, please see the following knowledge article as workarounds are identified.
Blank Page when Attempting to log into GlobalProtect VPN - Knowledge Base
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