I have AT&T Fiber Internet and the Pace 5268ac Gateway. My Deco X55 system is connected through Port #1 on the Pace 5268ac in DMZ+ mode. The Deco X55 is currently running in Wi-Fi router mode. The two additional Deco X55 antennas are Ethernet cable connected through the main antenna. The 2.4 Ghz and 5.0 Ghz Wi-Fi channels on the Pace 5268ac have been disabled. Everything works great.

The issue I am having is I cannot get any computer connected through the Deco X55 system to sync Internet time. If I connect through Ethernet cable to the Pace 5268ac, I am able to sync Internet time. I tried opening UDP Port 123 on the Deco X55 with no success. I turned off "Block Ping" on the Pace 5268ac with no success. I tried running the Deco X55 is Access Point Mode, but I lost connectivity with the Ethernet ports on the Deco X55 and only Wi-Fi worked. I double-checked the Pace 5268ac to confirm the Deco X55 was running in DMZ+ mode, and re-started both the Pace 5268ac and the Deco X55 with no success.

Am I missing something? Why won't Internet time sync when connected to the Deco X55, but will sync when connected to the Pace 5268ac? Does anyone have any other suggestions? Thank you...