I have a wr850g and have had no problems with xbox live until a couple days back. XBox complains about MTU setting beeing too low (wr850g does not allow modifying mtu settings, but it seems its set to 1492 now)Help!
I posted a solution under a different problem, but similar. Basically you will need to pick a static IP for your xbox. Then set that IP address in the router web config >> routing >> DMZ IP address setting. Restart both router and xbox and bingo. Your xbox is now directly connected to your cable modem without the router problems preventing connectivity.
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Starting on page 3-3 of the WR850G user manual, there is a setting for "PPP MTU".
Whether or not this will change the overall MTU of the router is not clear. Apparently the default setting is "0", which I would guess is automatic. I would try changing the setting to 1500 and work your way down from there until xbox live is hopefully satisfied.
Mine has been doing that lately too. Log into your router or what ever supplies internet to your xbox. Make sure the MTU is 1364 or higher. My router is set up to that and it still does that and doesn't work until the next day after about 12 hours I would guess. The xbox tells you what to do also.
1) Which connection did you talking about LAN/WAN?
2) Xbox live may not be up yet, can you verify it?
Most home gateway routers can only change WAM MTU for certain
connection type (PPPOE), and cannot set MTU for LAN and other WAN
To change MTU for PPPOE, going to WAN connection setting, and you will
see the MTU options box. But do not change it unless your ISP told you
to do so.
So make sure Xbox live is online -- I am no Xbox fun so I have no idea how it works, but just guess from your message.
Motorola WR850G router may fail to connect to xbox live after update to firmware 6.1.4. I was able to correct the problem. My solution was
Go in xbox >> network config >> IP and use Static option. Set the xbox to an IP in the range allowed by your router configuration. The router IP config range is found in the router config web >> Lan section. Then I set my router config >> Routing >> DMZ IP Address setting to the xbox ip I just assigned to my xbox. Restart router using the restart button on the Basic page of router config. Restart your xbox and attempt to login to xbox live. This solved my problem.
As a side note, on the xbox networking test page, the xbox live status message will allows show they are aware of a problem with xbox live login. This is a lie. For that reason I postponed trying to fix my router problem thinking it was an xbox issue, it is not. Once you finally connect to xbox live you will still notice this incorrect message remains. Microsoft developers ****...