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JohnDoe #1269
Diablo III was unable to retrieve necessary data(1)Category: Technical SupportJune-14-2015 9:16 AM PDT (10 years ago) Go to Blizzard forum post
I have been intermittently losing connection to D3 after the recent server maintenance. The game will crash and an error message will pop up:

Data Retrieval Error
"Diablo III was unable to retrieve necessary data. Please check your network connection."

I do not lose connection to Battle.net and my internet connection is stable. I am running Windows 7 Pro 64-bit and have not made any recent changes.
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Dankorii
Diablo III was unable to retrieve necessary data(2)June-15-2015 6:25 PM PDT (10 years ago) Go to Blizzard forum post
JohnDoe,

Make sure that your LAN settings and Internet Explorer settings are set correctly.

Here's a support article that will help:

Disabling Proxy Settings
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Got some feedback?
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Ibaraius
Diablo III was unable to retrieve necessary data(35)November-10-2015 2:43 AM PST (9 years ago) Go to Blizzard forum post
Hey all!

Gonna lock down this thread since this is an older thread. If you are still having the issue, please check out the newer thread at http://us.battle.net/d3/en/forum/topic/19741204663 and post any information you have about the issue there.

Thanks!
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