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You don't have to set an alternate port unless you have multiple Xboxes.
I also had to add an outbound NAT rule:
Firewall / NAT / Outbound
Select Hybrid outbound NAT rule generation then click Save.
In the Manual rules section click the plus to add a new rule.
Here's an important tip: in between changing these settings and retesting open NAT status on the Xbox, you have to clear firewall states for the Xbox or it will continue to report strict NAT. Under Firewall / Diagnostics / States search for the static IP of the Xbox. A red X button will pop up to clear all states for the matched IP address, click it, then retest NAT status on the Xbox. This tripped me up big time.
I also had to add an outbound NAT rule:
Firewall / NAT / Outbound
Select Hybrid outbound NAT rule generation then click Save.
In the Manual rules section click the plus to add a new rule.
- Interface: WAN
- Protocol: TCP/UDP
- Source address: Xbox
- Source port: Xbox_Live_Port
- Static-port: ENABLE
- Save
- Apply
Here's an important tip: in between changing these settings and retesting open NAT status on the Xbox, you have to clear firewall states for the Xbox or it will continue to report strict NAT. Under Firewall / Diagnostics / States search for the static IP of the Xbox. A red X button will pop up to clear all states for the matched IP address, click it, then retest NAT status on the Xbox. This tripped me up big time.
