Can't connect to XBL!

Please take a few minutes to read this guide, and then answer those questions in your thread.

OK this I've been having this problem the last few days and nothing seems to fix it. Every time I turn on my Xbox my Internet disconnects and when it finally connects it disconnects immediately after than when I turn off my Xbox my internet connection comes back. I've heard things from I need a dsl filter to my MTU is to low. When I run the Xbox  connection test I get to the internet portion and it always fails. I have a wired connection and I've tried everything from getting a static IP to formatting my hard drive. I've tried everything imaginable and nothing has even made any progress.

What Country/State/Province do you live in? Canada/Ontario

Modem brand & model number: 2WIRE/2701hg-g

Router brand & model number: Dlink/DIR 655, older model one.

Network Connection Type:Wired

If Wireless, what type of encryption are you using?

Things you have tried: Everything on the suggested on the "Test Xbox Live connection" menu, and on the trouble shooting webpage.

Is UPnP Enabled? Yes

Is NAT Type Open? Yes

Any Error Codes you encounter: No

What type of internet do you have? DSL

Who is your ISP(Internet Service Provider)? Bell Canada

When you run "Test Xbox LIVE connection" what is the exact message shown on screen?

Your network doesn't have a sufficient MTU setting. Xbox Live requires a minimum MTU setting of 1364.

On your PC, go to your router configuration web page and set the MTU to auto, or 1364 or higher. If that doesn't work, disconnect your console from the router and connect directly to the modem. Get help on the web with MTU settings at www.xbox.com/networkhelp.

My MTU settings are set at 1500 by default and I've tried connecting my Xbox directly to my modem, hasn't worked.

I have this exact problem.  Cleared cache, tested IPs, MTU, DMZ, uPNP, firewall, restored things to factory settings, tested different cables, straight to modem,  contacted ISP etc etc and nothing!  Help much appreciated as I have spent hours and hours trying to fix this.  Thanks

@bintmink How long has this been happening to you, I've been offline since Sunday night.

I think I have just joined you guys - have done all the tests, unplugged and repugged cables, switching xbox on and off, switching router on and off. Done about everything possible at my end and still not able to connect to xbox live.

I think it's the recent system update, I heard something about if you're Xbox gets bricked they send you a new one. But I think that was for the older models from 2005 or so. I'm gunna give Microsoft a call tomorrow and see if they could give me an answer. I'll be sure to post a solution if they give me one.

I just got disconnected like 30 minutes ago in the middle of watching netflix..... 6/2/11 around 9pm est.

It's been down for more than that for some of you? wth is going on >.> if this is like some PSN all over again i swear....

tell me about it. i recently switched back to xbox from ps3 because of that fiasco, please microsoft!!!! don't *** me like sony did!!!

@KennyXenph Yeah I've been down since Sunday of last week at around 10 pm est, so like 5 days so far. All I want to do is play BFBC2 with my friends and I can't even do that.

Rig, have you called your ISP about this issue yet? If not, please do so, and be sure to mention the MTU error.