NTP problem in FortiGate 100E

Hello,

FortiGate-100E # diag sys ntp status
synchronized: no, ntpsync: enabled, server-mode: enabled

ipv4 server(192.168.0.61) 192.168.0.61 -- unreachable(0x0) S:7 T:684
no data

I have the following issue: I have activated NTP on a FortiGate 100E. Unfortunately, I do not have a WAN interface configured on the interfaces, and I cannot assign an external IP address directly to the device. I want to extend the NTP address to the firewall through a tunnel, so the access is open. The access is open, and I can ping it from different interfaces that I have configured under "listen on interfaces."

However, it still cannot synchronize and has a 2-minute delay.

What could be the cause of this issue? What should I check first, and if possible, could you provide a solution?

#FortiGate #NTP #System_Settings