Here's my setup guide for getting the app working over 3G or external WiFi with a VPN. Hope it can help some people out there.
I setup a VPN on my desktop at home and when connected, it fools the app into thinking I am on the home network.
On Windows
1. In Windows 7, you open "Network and Sharing Center"
2. On the left, select "Change Adapter Settings"
3. Press Alt to get the File option and choose "New Incoming Connection"
4. Select your username and hit Next
5. Check "Through the Internet" and select Next
6. Make sure "Internet Protocol Version 4" is checked and hit Allow Access.
Setup port forwarding for port 1723 to your PC. Also check that PPTP passthrough is enabled in the router. Use
http://canyouseeme.org to check if your port is open. Once it is, go to the iPhone/iPad
On iPhone/iPad
1. Go to Settings>General>Network>VPN>Add VPN Configuration
2. Select PPTP
3. Description (Name), Server (IP Address), Account (PC Username) Password (PC Password)
4. Save and check if it connects.
When connected, you'll see a box that says VPN either beside the 3G or WiFi symbol or beside the battery percentage depending on what app you're in.
TWC App
1. Enable VPN and establish a connection first (VPN symbol in Status Bar)
2. Start the Time Warner Cable app
3. Enjoy 3G and external WiFi programming!
If on external WiFi, TWC app may detect VPN, disconnect WiFi then try the app again with VPN through 3G. Once it authorizes, close the app and reconnect with VPN through WiFi and it should work.
