I am having the same problem. Was able to log into Grizzly Hills then switched to another realm and got disconnected. Haven’t been able to log in since.
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Same issue here 
Anyone has idea when buff goes live?
Common Problems
Error WOW5190007
You have been disconnected
Error Code: BLZ51900007
This error primarily occurs for users with a Linux operating system. Linux is not supported for Blizzard games, but updating your version may help.
NOT USEING LINUX
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Ditto not using Linux either.
what buff?
I restarted B-net… it didn’t help.
I suspect the gnomes are behind all this. Again!
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Im not using linux
Restarting bnet didnt help. Still can’t get in.
Yeah, what buff?
We would be able to log in right now if you guys would stop using Linux.
50% bonus exp till pre patch
Same here. Same error. Same sad 
It just started for me about 5 minutes ago. Was logged in fine this morning, was swapping to an alt. I’ve restarted bnet and everything.
For classic
Yeah, if only…
So from the look of things “Error - BLZ51900007” is the error everyone is getting and most players cannot login to the game. I tried to search up a fix but every forum I find says it’s not real and that “you’re lying”. Which is unbelievably frustrating. This is the first post I’ve found in the past hour actually validating my issue.
I cannot login to Live WoW, Classic WoW, or TBC Classic WoW. So I think, given the fact that a lot of others are having the issue that it’s an issue with wow itself, on blizzard’s side but I’ll keep looking for a fix.
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So far been 30 mins Anyone have idea whats happening?
Same issue :-/
They are aware of it…Twitter confirmed
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