I really wish I could honest! But I don't know because I never got that error code

me to i have the same error sometime, u just need to reboo your wii u and that's all ^O^

delete shared data maybe?

Try performing a Connection Test in Internet Settings. Works for me despite how strange this seems.

Doing what ExpertGam suggested workedfor me Thanks!

same thing for me sigh#

you could try: using SSSL (look it up) or reconnecting but thats all i know