Same thing has happened again, running 8.5.2 5739.
After working normally for about 10 days, I noticed my hot tub had gone offline again. I could connect to it over the VLAN, but it could not connect from the VLAN over WAN to the cloud server. Reason: DNS was failing.
Here are my DNS settings:
Network
VLAN-Specific:
This setting works, but fails after about 10 days:
To work around the bug, I need to hard-code the DNS server IPs:
I don’t know what’s exactly going wrong, but it’s repeatable.
My theories:
- DNS server for the VLAN is crashing (but perhaps only for VLAN Ethernet devices?)
- Firewall starts blocking DNS requests (but only for Ethernet VLAN devices?)
- Gremlins?