Strict NAT, Wired, TRIED EVERYTHING

So ive had a problem for months on end with my nat type constantly being strict i have the BT Home Hub 5,

Ive tried opening all the ports, ive tried DMZ, static ip, resetting my router, powercycling my xbox, ive tried disconnecting all other devices, ive tried disabling and enabling upnp, helllppppppp

:)

 

Strict NAT, Tried everything

tried everything, never had a problem with my 360

What Country/State/Province do you live in? USA,California

Modem brand & model number: No personal modem, just the ethernet outlet set up by my apartment complex

Router brand & model number: Cisco Linksys E900

Wired or wireless: wired

Things you have tried: putting xbone in dmz, port fowarding, switched the xbox off mode 

Is UPnP Enabled? Yes

Do you have a NAT error? If so, what is your NAT type? Strict, "Your network is behind a port-symmetric NAT"

Any Error Codes you encounter: 0x40000000400000000

Who is your ISP?(Internet Service Provider): Cox Cable

 

Strict NAT, Tried everything

Yes, if I am correct that you are behind a NAT router and firewall they are managing. If, as I understand, you are getting Internet via CAT5e/6 from the wall and do not have your own modem, then that is almost certain. You can verify by looking at the WAN
IP of your E900, as reported in its web interface. If it is a private class IP (see explanation at
whatismyipaddress.com/private-ip), then your E900 is behind another NAT router--presumably your complex-wide one. It may be very difficult to convince them to open ports for you, and what
if another resident with an Xbox One wants the same? A port can only be forwarded to one host at a time...