If you consistently see an error message that states "Failed to get data from external server" this can occur when your computer thinks that the tokens that Twitch is sending are already expired. This can happen when your computers system clock has been set an hour ahead of your currently selected time zone. If the system clock is an hour ahead then the 30 minute authentication tokens that Twitch sends will always be expired.
In several states that have multiple time zones viewers will select a nearby time zone based on the location and then will manually adjust their clock to the correct time. This is not the right way to set the system clock, you need to select the correct time zone. Once the correct time zone has been selected, refresh the channel page and the error should be gone.
keyword: extensions, panel, error, external, server, clock