Blzbntagt00000840 (Solved with steps) - Spooky Month Flavor

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Blzbntagt00000840: I encountered this error today while updating World of Warcraft and will provide the steps and a TL;DR below. Please skip to the end to skip my Halloween Spirit rambling while I explain.

Blzbntagt00000840 and you! How to solve another “mystery error” that gets swept under the rug with “anti-virus shenanigans”. For the tech side of things, the relevant info is I am running on Windows 10 with a reliable antivirus. The steps might vary slightly for other versions of windows but are easily translated.
I was updating WoW today and could not update due to error: Blzbntagt00000840. After some extensive googling I kept finding people having to do a fresh install of either the game, the launcher, or both in order to solve the issue. I don’t have time for that. No one has time for that. I digress; After restarting the BlizzardLauncher several times to no avail and at my wits end I decided to open the task manager and give the launcher a final “End Task”… when I noticed the BlizzardUpdater app had not closed with it. Spooky right? Happy Halloween. So after hitting the BlizzardUpdater with the People’s Elbow (™ ?) I restarted the BlizzardLauncher and… Voila! WoW updated on launch and all was right in the world. I hope you enjoyed the story. Now for the TL;DR I promised earlier so the tech guys can add it to the black book.

  1. Close the Blizzard Launcher client.
  2. Open the Processes tab of the Task Manager (ctrl+alt+delete -> Task Manager -> Processes Tab)
  3. Search for any open instance of BlizzardApp or BlizzardUpdater.
  4. End Task all instances of BlizzardApp or BlizzardUpdater (Right Click -> End Task)
  5. Restart the Blizzard Launcher.
    Game Version Prior to error - Current patch
    OS: Windows 10
    Performed all troubleshooting steps blue-posted previously on these forums.

Hope it helps someone. Happy Spooktober.

5 Likes
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Wish I’d seen this before deleting the Battlenet app. Now i just can’t get it to download again. Keep getting a network fail at about 50%.

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For me, exiting the bnet client isn’t necessary. This is what I do to fix this:

Open task manager
Find the task with a WoW icon (It is the blizzard voice proxy)
Kill it
Update works fine :slight_smile:

11 Likes
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Thank you, this is what it was for me. (The voice proxy)

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Thank-you. Worked like a charm. It was the Proxy.

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You sir are a godsend

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Worked for me thanks your amazing now I can play Retail again woot!!:hugs:

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Yepper, Blizzard Voice Proxy was/is the culprit. Thanks Purityxd

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same here was the voice proxy specifically tried ending all but it and no bueno killed it and bam

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Manually killing Blizzard Voice Proxy via the task manager worked for me as well

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Just updating for today that manually ending the voice proxy in Processes within the task manager solved my error as well.

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i tried this because my classic wouldn’t download a patch and it didnt work i followed the steps i’ve already opened a ticket have not contacted yet but i tried this and it still gave me the error. did i do anything wrong? please reply because things didnt go exactly as stated.