Networking same zone with 2 different subnet : error

Hi,

We have installed our first sophos Xg135 yesterday but we have an issue with networking on 2 subets.

LAN 1 :

10.64.41.0

Masque : 255.255.255.128

Sophos IP : 10.64.41.4

 LAN 2 :

 172.31.84.0

Masque : 255.255.255.0

Between the 2 lan there is an HP Procurve (routing)

IP : 10.64.41.42 | 172.31.84.254

We have created a rule routing static : from 10.64.41.0 to 172.31.84.0 gateway : 10.64.41.42 => So computers on LAN1 can acces to LAN2

Computers on lan2 can acces to internet but they can't ping a server on lan1 (ex : 10.64.41.2)

There is a firewall rule too :

Accept any service going to "LAN" zone, when in "LAN" zone, and coming from "LAN_1" network, then apply log connections

and

Accept any service going to "LAN" zone, when in "LAN" zone, and coming from "LAN_2" network, then apply log connections