I know it's getting beyond a joke we see three or four threads a week all asking this very question. Newbies need to learn to search if the question they have has already been asked or worst case scenario check other sites before posting.
I will say there are more rude people on this site then years ago jumping at accusing one of a Newb Because of a simple post question! I was just wondering if if there was a new update, first time using a dns, didn't see any recent posts on a new update so I made one ! Now I really do not want to here people calling me a newb on a simple question, Fine I was in the wrong, I did above ask a mod to lock this thread. Once I found out, Now if that could be done I'd be happy!
Well, you are less newbie (in wii u scene) since you learned a new thing.
If you want to know why do that happen, it's because wii u tries to check for updates but fails because the DNS, and Nintendo never programmed an error for that, so it just displays update download error.
No: As far as I can make a non-programmer non-developer just-a-user assessment; The Wii U periodically checks for updates. If the connection to do so is stopped the Wii U Figures out there is a update but some sort of error in downloading it (because of the specific block to updates and nothing else)