Unable to connect to nintendo network

[Veritas12]

So it's been now 3 weeks since I'm unable to play online or even to access to the eshop by Sm4sh on my wii u. I tried to change my network but nothing has changed. Does anyone here have been encountered with the same issue ? And Therefore is there any way to fix it ?

 

[Metalbro]

Any error codes?
Could be firewall settings on your modem/router.

 

[Veritas12]

No I can't even receive any errors code. The game simply won't let me connecting to the nintendo network. I only managed to connect once before being unable again to log in...