[solved] FGT in transparent mode resolves all internal DNS requests to 1 IP

Hi folks,

just installed a FGT in transparent mode in the "BACK" of another Fortigate. (Because I try to offload some tasks, to this FGT).

This is working for surfing the internet, but not when I try to resolve internal domainnames.

Every internal lookup resolves to IP: 208.91.112.55

In the FGT I set the primary and secondary DNS Server to my internal DCs.

The networkconfig is:

LAN <-> (lanport) FGT Transparent (wanport) <-> (lanport) FGT NAT (wanport) <-> Internet

Any help will be very nice.

Thanks!