Impossible to connect from my box

Hello,

I encounter an error while trying to connect to the different services of Blizzard (website, Wow Classic, Wow retail). I got this error: blz51901016.

I tried the different solutions present on the topics about this error. However it didn’t resolve anything. (https://eu.forums.blizzard.com/fr/wow/t/impossible-de-se-conecter-blz51901016/31712) (https://us.battle.net/support/en/article/82450#:~:text=Type%20ipconfig%20%2Frenew%20in%20the,Return%20key%20on%20your%20keyboard.)

I tried connecting on my phone’s connection and it succeeded. So I guess it comes from the IP of my box.

Could you please help me to resolve this situation because the connection from my phone is not enough to play.