Express server not working on outside networks

Hi there, jonathan_nathan. We understand that you have a concern with opening up a 3rd party server and RDP. Let's look at that together. 

We see that you are able to access your server locally, but you are not externally. Viewing a sever from an outside source requires Port Forwarding. Let's make sure that the port forwarding is done correctly.  Follow these steps: 

1. Go to your gateway settings.
2. Select Firewall.
3. Enter the Device Access Code found on the side of your gateway.
4. Select NAT/Gaming.
5. If you get a warning message, restart your Wi-Fi gateway. Then, continue with these steps.
6. Select the application for port forwarding from the Service drop-down. If you don’t see your application, or you’re setting up port forwarding for a device:
   • Select Custom Services.
   • Enter the name for the application or device in Service Name.
   • Enter the port(s) you wish to open for Global Port Range. It's recommended to create a separate service entry for each port as opposed to using a port range. In this case the port number should be the same in the Global Port Range fields.
   • In Base Host Port, enter the port number used for the first Global Port Range section.
   • Select the appropriate Protocol from the drop-down for the application or device you are adding.
   • Select Add. Repeat as needed for additional applications and devices.
   • When all applications or devices have been added, select Return to NAT/Gaming. Your new applications or devices will display in the Applications list.
7. Select the device name or IP address of the device from the Needed by Device drop-down, to open the port.
8. Select Add.
9. When your selections display in Hosted Applications, select Save.

If they do not work the first time, then we do suggest that you factory reset the AT&T equipment. The reason why is, so that the router has a clean slate to work with. Follow these steps:

1. Press and hold the gateway Reset button for at least 15 seconds. If you let go before 15 seconds, the gateway will reboot, but it won’t reset.
2. Wait until the gateway restarts and all the status lights are lit. 
3. See if the Broadband or Service status lights are solid green. If so, the reset worked.

Try these things first and let us know. 

Matthew, AT&T Community Specialist

Does this change my network name, ip of the device, password, and or users connected to it?

Great question, jonathan_nathan.  We can answer that. 

What Port Forwarding is, you are opening the inbound and outbound IP traffic to you server. It does not change any configuration, such as usernames, passwords or IP address.

The only times those things change is if you manually go through and change them. 

Factory resetting the router, will revert the router back to settings prior to when it was first installed in your home. So any customized settings will have to redone.

If there is anything else that you need, please reach back out. 

Matthew, AT&T Community Forums