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Paunche #1434
I am getting error 21, please assist.(1)Category: Technical SupportAugust-20-2013 4:37 PM PDT (9 years ago) Go to Blizzard forum post
Hello, i just started getting this error today after playing since the games release.

here is what the game is telling me when i boot up:
I am getting an error occurred resetting D3D.
There was a problem with an authentication module (error 21).

please help in this ty.
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Omrakos
I am getting error 21, please assist.(2)August-20-2013 5:05 PM PDT (9 years ago) Go to Blizzard forum post
Paunche,

Can you post some information about your computer? You can find this information in the Direct X Diagnostic Tool:

Click on Start
Click on Run
Type in: dxdiag (In Vista, type dxdiag in the search field)
Hit Enter or OK

Click on the Save All Information button at the bottom, and create a dxdiag text file, and copy and paste it ALL here.

Could you also post your D3Prefs.txt file? It's located in the My Documents\Diablo III folder.

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Omrakos
I am getting error 21, please assist.(4)August-20-2013 5:57 PM PDT (9 years ago) Go to Blizzard forum post
Paunche ,

I'd still like to see your D3Prefs.txt file. Also, now that I've seen your dxdiag info, what make and model device are you using for a monitor? Is it an HDTV by chance?

_________________________________________________________
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Omrakos
I am getting error 21, please assist.(6)August-20-2013 7:19 PM PDT (9 years ago) Go to Blizzard forum post
Paunche,

Do you have a way to connect the monitor via a DVI connection instead of HDMI? Your dxdiag info is indicating a possible handshake problem as it doesn't seem to be able to pick up the monitor information.

You might also try seeing if playing in windowed mode lets it start without an error.

To do that outside the game, edit the D3Prefs.txt file when the game is closed.

Change this line

DisplayModeWindowMode "0"

to

DisplayModeWindowMode "1"

_________________________________________________________
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Omrakos
I am getting error 21, please assist.(13)August-21-2013 6:38 PM PDT (9 years ago) Go to Blizzard forum post
Paunche,

Are you using the Beta Battle.net Desktop App?

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Omrakos
I am getting error 21, please assist.(18)August-22-2013 12:56 PM PDT (9 years ago) Go to Blizzard forum post
Paunche,

Could you please uninstall the Beta Battle.net Desktop App and see if Diablo III will log in after that when run from it's own launcher?

_________________________________________________________
I'm available in the forums Monday - Friday, 12 pm - 8 pm Pacific Time
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