I have a wired connection from my XBOX 360 to a D-LINK DIR-615 router running firmware version 5.00NA (latest). I have forwarded all the necessary ports (21, 53, 80, 88, 1863, 3074 both UDP and TCP), but it keeps dropping connection to XBOX LIVE every10-15 minutes, no matter what game I am playing. The situation is even worst when there are other devices connected to the Internet. Every time I run a network test everything seems to be just fine, but the problem is still there. I have read many posts in different forums but I could not solve my problem so far. Can somebody please help me?
Just let me know what other information you need to dig deeper into this issue.