Setting up OWA access rule in SonicWall

Hi Guys,

I have difficulty setting up an OWA access rule in SonicWall.

I have SonicWall WAN connection (192.168.1.4)
.. coming from an ADSL router translating internet traffic to 192.168.1.4 -> SonicWall

LAN connection on 10.0.0.240 / 24
Exchange server on 10.0.0.27 / 24

I can't get the access rule / NAT to work:

ACCESS RULE:
From:  WAN
To:  LAN
Source Port:  Any
Service:  Exchange 2013 (http & https)
Source:  Any
Destination:  WAN Interface IP

NAT RULE:
Original Source:  Firewall Subnets
Translated Source:  WAN interface IP
Original Destination:  WAN interface IP
Translated Destination:  Exchange Server (10.0.0.27)
Original Service:  Exchange 2013 (http & https)
Translated Service:  Original
Inboud Interface:  Any
Outbound Interface:  Any

I've tried other configurations as well, but still no joy.

The log monitor has also not been really helpful, perhaps I am using wrong log-filter?