SSL Gateway positioned in a DMZ is trying to connect to the VDI via the External Network card
The connection will use the Network Binding order.
Make sure the internal network card is the first in the binding order.
1. Open Network and Sharing Center
2. Click Change Adapter settings
3. Hit Alt to show the hidden menus and click Advanced | Advanced Settings
4.Change the order
If the internal card cannot route to the Subnet of the VDIs, we'll try the other connections so if the binding order is correct, check the Gateway address for the internal Network card.