Linksys wrt54gs changing upnp settings

User is blank (left empty), admin is the password (when the Linksys is in default factory condition). Find MTU and change to manual and set to 1500 for broadband. Also, according to linksys, uPNP may not be compatible, so you may want to turn that off. Go to this link on Linksys to get a step-by-step setup for linksys routers and Xbox live. Also, pay special attention to section ii about upgrading your firmware to the latest version.

PS3 and Xbox ( NON BELKIN)

You Will Have to Disable the Firewall In Your modem / Router

And IF it is a router then Open The Ports

• TCP 80
• UDP 88
• UDP 3074
• TCP 3074
• UDP 53
• TCP 53

And also make sure that UPnP is Enabled

You'll need to log into the linksys router and find the setting for UPNP. Please make sure this is enabled. That should allow your NAT setting to at least Moderate, if not Open.

The reason why you're getting an MTU error is because the MTU has already reached the maximum # of packets that are being sent. To resolve it.
Access the GUI of your Linksys Router and go to the MTU settings. Set it to 1500. The lower, the better

This post may help you
http://andrewalliance.wordpress.com/2007/09/30/opening-nat-for-wrt54g-router/

This one is simple. Find the IP address that your Xbox is assigned by your router, then put it into the DMZ. This also goes for PS3 users who are having trouble with internet access.

You need to open all the ports for the xbox live. The NAT of that router model cannot be configured to open. Its just a simple NAT for internet connection.

Enable UPnP.....UPnP can help make sure NAT works correctly for Xbox LIVE. Usually, this can be set on your router configuration web page, which is supplied by your router manufacturer.

make sure that internet connection working fine first..if it is connect you xbox via wired or wireless(if wireless, make sure that you connect to your own wireless network and enter the wireless security if there is)...check if you can get an ip address, better set to obtain the ip address and dns of your xbox, if all set and still unable to access internet, access the linksys router setup page by typing 192.168.1.1 on the address bar of your internet explorer, when pop-up for username and password type admin under password, leave it empty for the username. Click administration tab and disabled UPnP. Check if your X-BOX working fine. Hope this help you.