Board Thread:Questions and Answers/@comment-173.17.106.144-20171124042213/@comment-34224387-20180125183456

121.58.234.198 wrote: Pent00x wrote: It seems to be a bug in the game. I am on Android and I experience the same problem from time to time, not only in duels, but also in underworld raids, where it shows a "CONNECTION ERROR: Failed to download configuration file" message despite having a working internet connection. For the "you need an internet connection" problem in duels, don't worry (unless if the notification pops up IMMEDIATELY after pressing fight)

To solve this, just keep on pressing "Fight"until you can fight the duel (although the chances for the fight to work is around 1 out of 5) Yeah thank you, but hilariously enough I figured out the same thing on my own, since I didn't use to play duels that often at the time of asking this question. Now that I am grinding for ascension, I found the solution. If the connection error appears right after you press fight, then you actually have an internet problem.

Otherwise, keep trying. It is not a chance by the way, it seems to be downloading/uploading something in portions every time you press fight. That's why on faster connections you only have to press 1-2 times.