Open up a command prompt, Win 7 - Type "CMD" In the search field in the START Menu, Win8 - Windows Key +X
Download the pftest file linked below, save to a easy to find directory
In the command prompt change the default directory to where you have the file saved
Then type "pftest list" to ensure you have the correct directory, then "pftest enable"
The text output should show that the necessary ports have been opened.
example: cd C:\Users\Josh\Desktop
Note: This may not work with all routers, for help in forwarding ports manually please contact support.
Collecting Gamestream logs
Sometimes it helps us debug your problems if we can take a look at the logs. If you need to collect the logs follow these steps:
Right click this, and select "save as" and it will default to a batch file.
Run the script. This will copy all the logs to a folder and open the folder in the Windows Explorer
Zip the contents of the folder and share it with support. Feel free to delete the local log folder afterwards to free up space.