filr not working thru a sonicwall firewall

Hi,

i don't know why FIRL does'nt work thru a sonicwall firewall.

2 DNS, one internal (internal IP adress), one external (public IP) that is NATted thru the firewall

configured the FILR applicance to do 443 redirection

Internal client --> internal IP address --> FIRL : work OK
external client --> external IP address --> SonicWall --> internal IP adress --> FILR : does'nt work

the sonicwall nat ports 80,443 and i also added 8080 and 8443 without succes

every other web sites published with the same type of config on the sonicwall are working ok
external client --> external IP address --> SonicWall --> internal IP adress --> website : work ok

what is wrong with my config ?