As part of the million jobs we have here at my office's IT group, I monitor a DFS location within the corporate infrastructure. This DFS folder is used as an output location by our internal software tools. Every time the software runs, it outputs several result files to the folder, and I have to work with them accordingly. Rather than constantly pinging on the folder to query for changes, I created a Folder Portal in Fences to this DFS location.

This worked fantastically, right up to the moment I went home and woke up my laptop. Pointing a Folder Portal to any network location which later goes offline is a surefire way to kill Explorer without any reliable way to stop it. Only after I connected to the office via VPN could I actually re-run Explorer long enough to remove the portal.

You might want to look into some sort of mechanism for disabling unreachable locations, or even just having it gracefully hide the portal if it's offline.