This issue was resolved with the help of the support team. It was not a Deco issue. There was an issue with the external router. It was set up correctly, but it retained some settings that were not...

@TP-Link Thank you for picking this up again. 1: Yes, that is correct. 2: Log of a successful, and unsuccessful attempt of connecting to the device in question: Wed Apr 21 08:21:46 2021 user.notice...

@TP-Link Nothing at all? Wasn't the update supposed to fix this? @Kevin_Z do you have any input?

@TP-Link Any response on this?

@TP-Link The Main deco is set up right after the my ISP router. DMZ open, so everything goes through to the deco. After that I have a cable to a switch, and a raspberrypi connected by cable. The port...

I am having the same issues. Deco M9 Plus. Unable to connect with IP or tplink DNS. Tried turning off antivirus and set QoS to standard (and removed all devices from priority). Any updates? Works...