I have only been running with asus ddns for a couple of months and this is the third outage I noticed, which is NOT ok. Ran with DYN before and never any problems...too bad they canceled the free accounts.
I can just confirm. I have had the exact same problem with vpn fusion activated. I have not been able to make it stable again without turning vpn fusion off. Seems to me that vpn fusion on creates problems with applying NAT rules, which can explain problems with internet access for all units...
Some reasons for these deauthorization /authourization logs:
*wifi unit like phone, tablet or other dropping wifi to preserve power
*Units moving around and shifting networks from 5ghz to 2.5ghz for example
*Ip is timed out and being renewed by dhcp
*Smart connect in router is shifting device...
1. No issue really?
2. Cant confirm any problem with ddns. I have been running with working ddns with all firmwares so far.
3. If your dynamic DNS does not work, then your VPN server wont work either. The routing will not work. Thats why you cant access it from internet.
Cheers