This has been driving me nuts since I got the phone. It would almost connect to my machine then just bog down and fail. Someone mentioned using a better USB cable and I tried it out of desperation. It WORKS! Apparently the USB cable that ships with the Epic 4G is kinda crappy. I plugged in the brand new cable and it just plain worked. 
Best $7 at newegg to date!

Best $7 at newegg to date!
