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Problem accessing the WAN from the Internal network if DMZ interface is active.

I recently setup Sophos UTM 9 on ESXi 5.5 with two Physical network interfaces(Internal & WAN) and this is working well. However, a newly created DMZ(VLAN 200 tagged-ESXi Virtual Switch) interface attached to the UTM's DMZ Interface(VLAN 200 tagged in UTM) is causing problems. 

As soon as the UTM's DMZ interface is turned on all traffic from the UTM internal interface to the UTM WAN interface is blocked. 

I tried adding a DNAT rule in this thread but it hasn't helped me.
I realize that one is for internal to internal or the DMZ but I have not found one referencing my specific problem. Any help would be greatly appreciated.


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  • Hi, and welcome to the User BB!

    If you don't have overlapping subnets on two interfaces, does #1 in Rulz give any clues?

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA