Zyxel Zyxel Prestige 841: Restore Factory Defaults

[quote user="aina juomas"]Modem brand & model number: ZyXEL Prestige 600 series[/quote]Is it the old black or silver version?

Access your router and make sure UPnP (Universal Plug and Play) is turned on. If you have configure Port Forward in the past, disable it.

Restore your Xbox network settings to factory defaults. Test your Xbox LIVE Connection.

You may also want to clear your Xbox system cache. This will remove temporary files from the system cache.

Keep us posted!

Sorry for the delay!

I found the manual for the AMG1302-TSeries, and it seems that there is no later version of firmware than the one already installed. The software for this device can only be updated manually. ftp://ftp.zyxel.co.uk

Could you try restore your Zyxel gateway back to factory defaults. Before you do so, if you use PPPoA/PPPoE connectivity, you have to know the username and password assigned by your ISP, for the access and authentication method.

Unplug all existing devices from the Zyxel gatway (except for the power supply). Locate the reset button (at the back). Press and hold for 10 seconds. Power off the gateway for a couple of minutes. Plug in everything back up and wait one minute for it to connect
properly.

Reconfigure the Zyxel, (manually) such as, wireless security and UPnP.

Post back and let us know how that goes and we'll go from there.

Yes, the Zyxel is a gateway (modem+router), and you have problematic double NAT as a result. If you have access to the right settings, you can put the Zyxel in bridge mode as explained on page 22 of the manual here:

ftp.zyxel.com/.../P-660RU-T1%20v3s_1.01.pdf

This is the best solution, but your ISP may block those settings. If it does, and if it is unwilling to set it to bridge mode for you, another option is to disable DHCP on the Belkin and connect the Zyxel to a LAN port on the Belkin rather than WAN. Reboot
Zyxel, Belkin, Xbox, and Xbox should get an IP from the Zyxel via DHCP (reserve this IP if the Zyxel supports that). You will then need to do all necessary port forwarding to the Xbox using the Zyxel unless the Zyxel properly implements UPnP (in which case
enable that).

Can you do a factory reset of the network settings and try again, if that fails try connect direct to the Zyxel as a test

Just to be clear, when you disabled DHCP on the Belkin, did you then connect the Zyxel to a LAN port on the Belkin? Did you verify the IP you used for port forwarding on the Zyxel was the new IP the Xbox One got from the Zyxel, not the one it had from the
Belkin? If so, that should work unless something else is going on--can you get open NAT with the Xbox One directly wired to the Zyxel (with ports forwarded)? If not, that is a problem.

As far as settings for bridge mode, I'm not familiar with your ISP so I'm not sue which setting is best on the Zyxel. On the Belkin, you need to match the current ISP setting on the Zyxel--i.e. if Zyxel is using PPPoE, set the Belkin to that. You will probably
need to enter authentication (user/pass) depending on what that setting is...