It's just a popup for an advertisement, cancelling should be fine.
Also, an odd thing I noticed in the certificate is the given date (23/12/2014) is yet to come, and it says "expired".
Which suggests a closer look at the current time and date set on the iPad. A date/time mismatch can cause all kinds of authentication issues.
I'm not sure, but I think that is what Jaba is saying. That his children had somehow set the iPad's clock incorrectly and caused the issues.
Which makes this post a bit late and redundant.
That was the reason for his issue.I think he means his children advanced the clock to get more daily rewards in some games, or get some lives in some games, to make them replenish faster.