I was attempting to play FFXI (I know, kinda old), and when PlayOnline Viewer starts, I click 'Next'. It does it's stuff, then it errors with:
OL-1160 Network is busy or there are connection problems. Please try again later or verify that cables, networking devices, and network settings are properly configured."
However, I can connect to the internet, and it does this every single time I try to run the game.