Cannot sync; no internet connection found

My levels are no longer syncing across my mobile devices, and I don’t seem to be able to connect to the Candy Crush servers from the app.  When I try to log out of the app to save my progress, I get the message “Internet Connection Not Found."  This happens from all of my mobile devices.  But I am connected to the internet, and my connection is working for everything other than the Candy Crush app.  I am able to log in and out on the King.com website, but my progress isn’t synced there.  All of my iOS and Candy Crush software is up-to-date, and I’ve tried quitting the app and restarting all my devices.  The only thing I haven’t tried is deleting the app and reinstalling, because I can’t properly log out to save my progress.  Can someone fix this connection/syncing problem?