What Country/State/Province do you live in? UK/England/North Somerset
Router brand & model number: Zyxel - P-660HW-T1_v2
Network Connection Type: Wireless/Wired - Both
If Wireless, what type of encryption are you using? WPA-PSK
Things you have tried:
Is UPnP Enabled? Yes
Is NAT Type Open? Strict
Any Error Codes you encounter:
Can't connect to xbox live party
What type of internet do you have? ADSL
Who is your ISP(Internet Service Provider)? Post Office
When you run "Test Xbox LIVE connection" what is the exact message shown on screen?
"you can connect to xbox live, but your current network configuration may limit your online experience. Select more info for a description of the problem and how you can fix it".