Can't log on to retail but able to log on classic

Like title says. When i try to log on retail it gives me "You have been disconnected. (BLZ51903006) just like few days ago. multiple days unable to play when i have free time.

oh, i just have a problem kinda like yours, my problem i in the launcher, cant update the game so, cant log in

but can perfectly log in in classic, did you find an answer ?

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