There is a site to site IPSEC VPN between the two sites and the remote site subnet had been added into the Remote Management trusted subnets.
The issue lies with the Microsoft ISA 2006 component within the Celestix WSA appliance, that is used to protect Microsoft IAG.
First of all I would create a static route on the appliance. This can be done either by using the command line and adding a persistent route, using the jog dial on the front of the Celestix WSA appliance or using the Celestix Web UI (
Once this is done, I would start up Microsoft ISA Server on the appliance, expand "Configuration", select "Networks", go to the "Networks" tab, right click for "Properties" of the internal network, select the "Addresses" tab, click the "Add Adapter" button, and select the "LAN" tickbox.
This will apply the all the routes that the LAN card can see, including the new static route(s). Once trusted, you will be able to access resources within the defined subnets, and ISA will be able to allow the traffic defined from the site to site VPN.
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