@stephenw10 Straightforwardly, AFAICT (see below). This configuration is translated straight from my working OpenWRT configuration, double-checked, etc. For he.net, hostname and username are the same (the domain to use). The 'Interface to monitor' dropdown only has WAN and my other LAN interfaces, no special separate interface for 6rd.
Even if these details were wrong, I would expect to see something other than 'Couldn't connect to server' in the logs. It seems like there is some deeper issue preventing the DDNS handler from even contacting the he.net server.
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