Connectivity Loss & FortiGuard Sync Issues on FortiGate KVM (v7.2.11) Post-Reboot

Environment Details

• Model: FortiGate-VM (KVM)

• Firmware Version: 7.2.11

• Hypervisor: KVM (QEMU/Libvirt)

• Setup: Standard LAN-to-WAN routing

Problem Description

I am experiencing a recurring issue where LAN-to-WAN connectivity functions perfectly upon initial configuration but fails consistently following a system reboot.

Symptoms include:

1. FortiGuard Disconnect: The dashboard shows a "Time Sync Error" or "Unable to connect to FortiGuard."

2. Traffic Interruption: LAN users lose the ability to route traffic to the WAN.

3. DNS Failures: DNS resolution via FortiGuard or system servers fails.

Troubleshooting Performed

• Verified basic firewall policies and static routes (all appear correct).

• Confirmed that the issue specifically triggers after a reboot.

• Attempted to manually set the time, but the error persists or returns.

Regards

Santosh