Foris WAN tab crash after modification of /etc/config/network DNS
"When a user manually configures the /etc/config/network to use multiple DNS, the Foris tab for WAN won't load up. Error is raised instead. The config mode (static, auto DHCP, etc.) does not matter. Failing in any case."
https://forum.turris.cz/t/foris-wan-tab-error-when-dns-list-used-in-config/3925