I can use Duolingo app with 3G, but not with Wifi.
When I turn off mobile data (3G), but am still on Wifi on my android, the Duolingo app seems to think I am offline. (However, I know I am not offline because my browser still connects to the internet). With 3G on, the app works fine.
This started to happen to me today; last week, I could do Duolingo on Wifi just fine.
Any idea what could be happening?
I have a very similar issue. I have to turn off wifi to use duolingo (as it defaults to use wifi when available instead of cellular data). I don't need to do this with any other app and duolingo did not have this issue before. This started a moth or more ago.
Is Duolingo doing something strange on the network that my firewall might block?
December 23 UPDATE: OK - it hung forever and ever, and finally started the lesson (over wi-fi). Then, it hung forever and ever on the first question. I waited it. Out . It finally worked! Now it seems to be working. So, it must be on Duo's end, I'd think.
December 23 2018 - I de-install the app, even though I heard this has made no difference to others. I reinstall it. I get a BRAND NEW version of Duolingo. (No more hearts). It looks different. But it STILL WILL NOT connect to the network. (This is a correction to my previous post)
DECEMBER 30th 2018 - Whew! - Finally fixed it. My home network is Comcast XFinity which does not support IP6. However, my Zoom router does support IPv6. Duolingo seems to fail in this situation (even though nothing else does). So, I went into my router, and disabled IPv6. Now, everything works and my home network seems unaffected. With the Zoom router, there was not a simply IPv6 on/off selection. Instead, I had to go into DHCP6 and uncheck the "enable" button on DHCP6 "prefix delegation". Thanks to others who mentioned IPv6 on other forums or posts. It is now consistently working.