Direct Access IP-HTTPS traffic blocked in Smoothwall Inverness-8

[LemonEntry]

I'm receiving the following on my Firewall log, an entry every second. It's been happening since upgrading from Glamis to Inverness-8 approximately a week ago.

Time        Inbound interface    Outbound interface    Source IP    Destination IP      Protocol    Source Port    Destination Port    Rule                  Action
1:31:24 PM    Port 2 (EXTERNAL)    N/A                 (DA Server)    (SW Ext Iface)   TCP (6)     HTTPS (443)     53233           Bad external traffic       Reject

 

The weird thing is that traffic from the Direct Access server is being blocked at the *external* smoothwall interface, to which it shouldn't have a route except through the internal interface.

Any idea if this is typical, or if I have a bad rule somewhere? The bizarre thing is that from the look of my Helpdesk queue, Direct Access still works!