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space_taxi98's profile

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5 Messages

Thursday, September 21st, 2023 8:21 PM

IP Passthrough and Port Forwarding - AT&T Fiber HUMAX BGW320-500 with TP-Link AX11000 as Passthrough Device

I have AT&T Fiber with a HUMAX BGW320-500 modem, and have been having a lot of trouble getting ports to open on this modem. I am primarily trying to assign a custom port in Plex, something other than 32400 to allow remote access for specific family members to view some family photos and footage.

I worked with AT&T Support on this for quite some time, they were unable to assist or resolve and routed me to a 3rd party support team via mobile support that suggested using a 3rd party router with IP passthrough and configure the 3rd party router to handle the forwarding.

I have this configured using the steps from the second comment in the post here:

Everything is working, all my wired ethernet devices are working off the new router and Wifi is also working fine. I added two ports to port forwarding in the AX11000 with the specific IP of the machine in question that I want to allow, however it still shows "Not available outside your network" in Plex.

If I use an online port checker such as - when entering 32400 it shows as open. However my other custom ports 28076 and 36927 are showing as closed. I added some rules in Windows Firewall and checking at command prompt using "netsh firewall show state" I am seeing

Firewall status:
Profile                           = Standard
Operational mode                  = Enable
Exception mode                    = Enable
Multicast/broadcast response mode = Enable
Notification mode                 = Enable
Group policy version              = Windows Defender Firewall
Remote admin mode                 = Disable

Ports currently open on all network interfaces:
Port   Protocol  Version  Program
28076  TCP       Any      (null)
36927  TCP       Any      (null)

It isn't making sense to me that I'm unable to open this port on my standard AT&T equipment, and still unable after following the suggestion from the independent support that AT&T forwarded me to. I have the proof of chat history from AT&T about this issue if needed. I posted this earlier and it appears to have been removed. 

Community Support


225.7K Messages

3 months ago

We hear you, and happy to guide you @space_taxi98!


We recommend that you contact our HomeTech Protection Team as they specialize in assisting with third party devices. We appreciate your understanding.


For further assistance, we are always here to help!


Nate, AT&T Community Forum Specialist.


ACE - Expert


33.6K Messages

3 months ago

I have no idea where cgigate gets his information about lowering speed by about 70%.  That may be true in certain configurations, but should not be accepted as a blanket truth for all customers running IP Passthrough.

@space_taxi98 , regarding your open port issue, can you confirm that there is something listening to the two ports that aren't showing as open via the port scanner?  Can you test accessing it from another local machine and confirm that the port responds?

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