Results, looks like it is AWS IoT, which is used for "continuously audit security configurations for compliance with security best practices and your own organizational security policies"
netstat -ap | grep aws
tcp 0 1 GT-AXE16000-xxxx.:41826...
I can't see the complete url unfortunately, the only thing I can see is the server name, all of which are variants of .compute.amazonaws.com. For example, ec2-54-244-146-91.us-west-2.compute.amazonaws.com.
I'm using firmware version 3.0.0.4.388_23012.
I just noticed all of my Asus WiFi...
My gt-axe16000 tries to connect to various .compute.amazonaws.com servers on port 8883. What is that for? I've searched everywhere and can't find anything on that.
Try setting the time manually and then try using the NTP server again. The router time needs to be close to the actual time of the NTP server to be able to be set with the NTP server.
If you had a hardware XG you could put one AP for a guest wifi network on one ethernet port and one AP for regular users on another ethernet port. That and a few changes to the configuration (a new Guest WIFI zone, a DHCP server for each ethernet port, some firewall rules, etc.) should provide...