OK, I decided to make a new post describing how I setup my ATT-Uverse | Pace 5268AC router/modem (5268AC) after many failed attempts. I tried everything suggested in all the posts I could find (here & elsewhere) and some suggested by others here (thanks again) and nothing seemed to work. Here is what I did and would suggest to you if you have a ATT-Uverse | Pace 5268AC | Software Version 10.5.3.527171-att modem/router. If this helps you or if you find I left a step out or would like a clarification let me know, Ill try to help out when I can.
15 Steps to Happiness!
1. As a last ditch effort I unplugged everything (including my WiFi AP and all Uverse boxes), the only thing left was the Plex server and 5268AC router/modem. I than reset everything back to factory default settings, rebooted and started over.
2. Next go into the Network Adapter Settings of your Plex server NIC and set your IP address to a static IP (Example 192.168.1.100), Just pick one that is not being used by anything else in your system. You can see what is currently assigned in LAN IP Address Allocation in your 5268AC. (fig.1.2) Follow these instructions from Port Forward Dot Com.
3. Under Settings > Lan-Status > LAN IP Address Allocation tab in your 5268AC, set your Plex server to the same IP address (Example 192.168.1.100). This will insure you have a direct/consistent connection from the modem/router to your Plex server. Don’t forget to save your changes (Save" button at the bottom right (fig.1.2).
4. Now click on the Firewall > Applications, Pinholes and DMZ tab, scroll to the bottom of the page and select Add a new user-defined application (fig.1.3 - fig.1.4 -fig.1.4.0.a).
5. Than in the Application Profile Name box enter the name of your Plex server (call it anything you want, doesn’t have to match anything as long as you can remember it, example PLEX-R-US (fig.1.4.0.b).
6. To the right of Protocol select the TCP radial button (you will start here for UDP (fig.1.4.0.b).
7. In the two boxes to the right of Port (or Range) these port numbers need to match each other. As long as you didn’t define a custom port number for Manually specify public port in Plex (Fig.0.1), than you will use the default port number of 32400 in those two boxes (fig.1.4.0.b).
8. However, If you did defined a custom port in your Plex server under Manually specify public port as say port 33509 (Fig.0.2), than you will need to enter for example 33509 into the two port boxes besides Port (or Range) in the 5268AC (Fig.1.4.0.c).
9. For Protocol Timeout just use the default of 86400 for TCP and 600 for UDP (Fig.1.4.0.b).
10. For Map to Host Port ONLY enter the Plex default port of 32400 in the box. If your using a custom port, DO NOT ENTER YOUR CUSTOM PORT NUMBER IN THIS BOX. Only enter the Plex default port of 32400.(Very, VERY Important, don’t overlook this one) (Fig.1.4.0.b).
11. For the Application Type, just leave it blank. and on the lower right press the Add To List tab (Fig.1.4.0.b).
12. Now go back to step 3.C. and instead of checking TCP radial button, check UDP instead and repeat steps 3C to 3.G.
13. Once you’ve completed that, go to the Firewall/Status tab, you should see the two holes you created (Fig.1.3.1).
14. Now go back to the Applications, Pinholes and DMZ tab and at this point your 5268AC router/modem should be seeing your Plex server IP (192.168.1.100) or by name (PLEX-R-US) and select it from the menu box under Application List or type your IP address into into the search box at the bottom "Enter IP address either of which should select your Plex serve (Fig.1.4.a).
15. Scroll down to the bottom of the Applications, Pinholes and DMZ page and find the hole you created (Example PLEX-R-US) in the Application List., than select it and press the Add button and then the Save button at the lower right (Fig.1.4.b).
NOTE: If things still aren’t working, start off by rechecking all your entries. Then restart your Plex server and the browser you are using to setup your configuration.
