Can't launch WoW

From the launcher, clicking play, then it attempts to switch to login, and immediately says I’m disconnected, with a BLZ51901016 error message. Was fine just 8 hours ago. Tried restarting the launcher app; did not help.

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You’ll definitely want to poke the folks at Tech Support about this one.

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While you’re waiting for a reply in TS, there are some steps you can take in the Support Article for error BLZ51901016

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Thank you. Running that now.