Here, the crawl class is choking most of the UDP/uTP traffic. It still works. I have to kill it or it will totally wreck all of the networks. Ratio of upload to download varies hugely. Can be 20:1 or as high as 1000:1. I work on the 20:1 figure normally, but have been unpleasantly surprised on several occasions. Try to do a test, see if your app is consistent in any way. Or use the 50:1 figure if you're a pessimist I've always addressed RTMPT port 1935, but it hasn't had so much effect. I think the belt 'n braces approach is the only thing likely to prove successful! I am still finding my downloads to be very much worse using uTP. The best I have done with the uTP taking over most connections was about a quarter of my normal speed. What are you finding?