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Outlook doesn't connect from a VM in VLAN

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  • Outlook doesn't connect from a VM in VLAN

    I have a strange problem.
    I have a Sonicwall NSA, behind this appliance I have a (VM) Exchange 2013 server in the normal LAN (and a DC).
    I have also a VM that's running in VLAN 12, when I want to connect to the Exchange 2013
    server (by mailaddress and password, Autodiscover) then I get a error that it can't
    find the address at the addresslist. (from the 3 tests, the first one will pass, the last one gives this error)
    But when I start Outlook on a server in the same LAN then it works good.
    When I connect external from another place, it connects also and works good.
    The Sonicwall creates also automatic loopback NAT rules.
    I can also reach the OAB and I can login. OWA works also.
    I don't understand why the Outlook connection doesn't work.
    (I test it with a few 2008 R2 VM's in different VLANs)