GlobalProtect SSL VPN connection gets disconnected due to keepalive failure

• GlobalProtect SSL VPN connection gets disconnected due to a timeout.
• pan_gp_event.log of globalprotect display the following

[Info ]: Auto Gateway login finished with address 192.168.11.1 and user gp.
[Info ]: SSL tunnel creation finished with Gateway 192.168.11.1.
[Info ]: Completed HIP Report check with Gateway 192.168.11.1.
[Info ]: HIP Report submitted to the Gateway 192.168.11.1.
[Info ]: Tunnel is down due to keep-alive timeout. 
[Info ]: Gateway 192.168.11.1: Checking network availability and restoring VPN connection when network is available.

• PanGPS.log also reports keepalive failures.

Info (1335): --Too many outstanding keepalive and no response from GP gateway, disconnect tunnel
Debug(1338): Tunnel downtime after keep-alive timeout is 51375 ms
Info ( 631): VPN timeout due to keepalive, get out of ProcMonitor
Debug( 646): In timeout handling, tunnel downtime is 51375 miliseconds

• Palo Alto Firewalls or Prisma Access Firewalls
• PAN-OS 9.1.17
• PAN-OS 10.1.11-h4, 10.1.11-h5, 10.1.12
• PAN-OS 10.2.7-h3
• PAN-OS 11.0.3, 11.0.3-h1, 11.0.3-h3
• PAN-OS 11.1.0 11.1.1
• GlobalProtect (GP) Gateway
• GlobalProtect (GP) App

• PAN-OS 9.1.18
• PAN-OS 10.1.13
• PAN-OS 10.2.8
• PAN-OS 11.0.3-h5, 11.0.4
• PAN-OS 11.1.2
   

1. Upgrade to the fixed code will resolve the issue.
2. As a workaround, use IPSec Connection instead of SSL.