You have been disconnected (BLZ51903006)

“You have been disconnected (BLZ51903006)”
Why is this happening? What is this disconnection??
Anyone else having this popping up?

It is an issue with your connection
https://us.battle.net/support/en/article/21839

I actually got this today, popped up immediately after trying to log in. No connection issue.
had to log via the launcher.
there were quite a few complaints about the same issue in the US last week.
I hope it doesn’t happen again.

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