Administrator log out Auto

When I try to login in Fortigate 60D from wan interface IP (10.*.*.241) from another network. It logged in for few seconds(i.e. 3 second, 5 seconds) and automatically logout. when I saw in forticloud> Fortiview> Admin Session it shows a reason is Violation.

as also i attached screen short.

Please suggest a solution. I'm new in fortigate.

But in same place when i tried to login from network behind the firewall. It's work fine.