Seems like I'll be another user who got this magically working without knowing what have I done wrong. I tried the same with the 3rd version of the controller. I deleted all ddns configuration,...

@Hank21 1. yes 2. I can force a new WAN IP by restarting the modem, I can just wait because periodically my ISP assigns new IP. I can see no logs re DDNS update (though I don't know whether I should...

I don't expect anything to be wrong here, as both of these configurations send a single update, but here they are: Yes, I tried to enable it when I was trying to debug. ;) This one also send a single...

@Virgo Yes, when I switch the config off and on again, it sends a single update. Although I think it was not the case with the previous controller versions, I needed to create a completely new...

I use az ER605 with a SW controller. Tried version 5.8.4, 5.9.9 and now 5.9.31, they all behave the same. After I configure NO-IP DDNS, the first update arrives, but nothing else. I tried to select...