FortiGate is connecting FortiManager via IPv6 in an IPv4 network

[Brieftaube]

Hello community,

we have four FortiGates being connected in an IPv4 network to our Fortimanager.

A routine look in our Fortimanager logs showed me some unusual entries about two Fortigates connecting our FortiManager via IPv6 (some data has been obfuscated due to privacy reasons) to update its AntiVir/AntiSpam-sigantures:

2016-09-26 13:19:11 log_id=0017026006 type=event subtype=fgd pri=information msg="Receive a device update request" remote_ip="::d05c:402:0:0" serial="FG100D<obfuscated>" uid=""   Our FG100D mentioned above is set up with a private IPv4-IP to connect to the FortiManager, so I have no idea why the FortiGate is using ipv6.   Is there any reason for this or maybe a hidden config command where I can disable ipv6 or force using ipv4?   I hope you can shed up some light in the dark.   Kind Regards from Germany,   Brieftaube

[emnoc]

You could try the following cli and see if the problem goes away ;

config system central-manageme

    set fmg-source-ip <x.x.x.x> <------PLACE THE EXACT INTERFACE ADDRESS

    unset fmg-source-ip6   <-Disable IPV6 if set 

end