Error code BLZBNTAGT00000840

Desktop App Tech Support
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Im struggling to find a resolution to the error code BLZBNTAGT00000840 when trying to update/launch warzone. Ive scanned for damaged files, reinstalled battlenet and reinstalled the game. Any help would be greatly appreciated.

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Same exact issue here with World of Warcraft…
There is a fix here How to fix Warzone 2.0 /MW unlimited scan & repair loop (Without re-downloading the game) - YouTube
Worked for me and plenty of others Good luck

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thanks for the help, unfortunately im no closer to resolving it

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Hey there!

Thank you for taking the time to report this error here. This specific error code can have many potential causes ranging from a conflicting third-party program to a network-related problem preventing the patch. Try the following to narrow this down further:

  1. Try a DNS Flush to clear out any corrupted or stagnate network data.
  2. Fully update or temporarily uninstall security programs which may be interfering with your connection to the server(s). More information on troubleshooting security applications here, if curious.
  3. Test an alternate network such as a mobile hotspot or VPN to determine whether the problem is isolated to your current network.

If you’re still unable to patch, please run a WinMTR network test so that we can further investigate the problem. Here are the instructions:

  1. Download the tool from this page
  2. In the “Host” field, enter “eu.patch.battle.net” (without quotes).
  3. Start the test and then try to update Call of Duty as normal. Ensure the error occurs while the winMTR tool is running.
  4. After recording data for about 5 minutes, click “export text” and save the winMTR file in an easy to find location.
  5. Once you have that made, open the file. You’ll need to copy and paste the contents of the Text document into the post, and put four Tilde (~) marks above the winMTR. It’ll look like this:
WinMTR goes here

If you have issues pasting here, please use Pastebin and post the link (ex: Pastebin (dot) com/123456).

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