AT&T 51001-51999 ports conflict with a gateway reserved port

Let's see if we can help you with your Port Forwarding, @dmora7091.

Here is more information on the Ports that we block on our end for Port Forwarding. There are some Ports that are blocked on our end because if they are opened they can cause DDOS attacks and other major problems on your AT&T gateway.

Let us know if you have any more questions about Port Forwarding as we are here to help.

Marc, AT&T Community Specialist

Since the part of the question about a workaround was ignored, I'm left to assume there is no workaround and therefore some games just can't be played when getting internet through AT&T. Sounds like it's time for me to find a different internet provider?

@npeirce 

@ATTHelp provided you a direct link to the specific ports that are block and the reason(s) why. You can either pick different ports for your gaming or feel free to move to another provider.

50001/TCP, 51001-51003/TCP, 51010-51011/TCP, 51020/TCP:

These ports are numbered from the dynamic/private ephemeral port range. Their use varies according to implementation and may include end-user device management.

Blocking these ports protects customers from malicious activity, which may include data exposure or attacks against the end user devices.

Dave

These ports are numbered from the dynamic/private ephemeral port range. Their use varies according to implementation and may include end-user device management.

Very well spoken, but I suspect someone who understands what you meant by that probably doesn't need your help in the first place, right? 😅

Similarly, someone who knows how to "pick different ports" and yet is stumped by a "ports conflict" seems like a rare bird.

Maybe a good place to start for the uninitiated masses would be where to pick different ports?

...in the modem/router's port forwarding? but the dialog only allows for two numbers.

...in the application that needs the reserved ports? but there seems to be no such options in discord/wow/ffxiv/etc.

...in the Windows registry? oddly more than one webpage in google results went there first thing. 😱

I believe you're saying...

1. Decide on a smaller port range: Start with the port range that the game or application says it needs, but trim that down to an arbitrarily smaller range -- one that doesn't overlap with any reserved port here: https://about.att.com/sites/broadband/network

2. Place the arbitrarily smaller port range in the modem/router like in here: http://192.168.1.254/cgi-bin/apphosting.ha

(To be clear, the arbitrarily smaller range doesn't need to be the entire original range minus precisely the reserved ports. If it did, the result would be several numbers. That's why being able to enter only two numbers in the modem/router's port forwarding is sufficient.)

3. The game or other application should have the ability to change the port range that internet searches said it "needs" inside the application itself. It doesn't really need the whole range. Find the application's dialog that's designed for this purpose and use that to replace the larger range with the arbitrarily smaller range.

I'm trying to do this for Discord but I don't see anywhere in the desktop app to define ports.

Just Google your apps to configure different ports.

Is that not what you meant by that? Configure different ports inside the game/app?

[after changing the ports in the firewall/gateway/modem/router] Then you need to adjust your Gaming machine to adjust to those open ports.

Adjust the machine? Where? Inside the game/app? Adjust how? Enter the smaller range of ports into the game/app? If so, seems you're restating the same thing as googling about the app to configure different ports OR do you mean some other kind of adjustment?

I found this mention of ports...

https://support.discord.com/hc/en-us/community/posts/360032660992-Please-consider-adding-UPnP-port-forwarding-to-the-options

manually forwarding ports for discord requires a huge UDP range to be left open, 50000-65535

That seems to imply Discord doesn't have a feature where a smaller range of ports can be entered.

Thanks.