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I know this borders on technical support but...

An answer given here seems to indicate that Error 3003 represents an error related to not playing in the proper region, although I have the full game and am in the Americas region.

What is the actual technical explanation of this error? I get Error 3003 about 50% when I try to play and it results in a very long wait for a timeout after attempting a login before I'm told I have a 3003.

Is this just Blizzards way of throttling the number of login attempts made by a single user by closing the connection server side without sending a FIN to the client indicating the connection should be closed?

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Have you tried Blizzard's Diablo technical support forums? –  dlanod May 22 '12 at 5:50
    
I haven't. I like the stack exchange community better :D –  whaley May 22 '12 at 14:14
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3 Answers 3

up vote 1 down vote accepted

Looks like it's a bug that is affecting many users at this moment. As you can see, the Technical Support is looking after it, and they're working to solve it. For the moment you can try what the support suggested and eventually report your experience in that thread on the official forum.

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One of the most common reasons for error 3003 when your internet connection is working is that the Blizzard account servers are down for maintenance.

When getting a 3003 error, look for a message on the Diablo 3 loading screen to see whether the service is down for scheduled maintenance, and when it will return if it is.

For example, at present, Diablo 3 displays the following in the "Breaking News" section for the American region:

We will be performing scheduled maintenance beginning on Tuesday, May 22, at 1:00 a.m. PDT, and we expect the service to be available again at approximately 9:00 a.m. PDT [12 p.m. Eastern]. During this time the game will be unavailable for play.

Additionally, the Account Management, Blizzard store, Forums, and the rest of our website will be unavailable from 1:00 a.m. PDT until approximately 3:00 a.m. PDT [6 a.m. Eastern].

Apparently, it was the Blizzard store and account servers being down for maintenance that resulted in a 3003 error, as now that the store is back from maintenance, Diablo III is proceeding past the login step, and then displaying a message that the game servers are down for maintenance.

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That can't be it, as it seems to happen during all hours of the day (and not during peak usage) and also when us.battle.net/d3/en/status is showing the Americas Game Server status as up. –  whaley May 22 '12 at 20:09
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This seems to be something that they have now fixed:

http://us.battle.net/support/en/blog/5658917

3003

"Unable to connect to the service or connection was interrupted"

This issue is now resolved.

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Take a look at this post and you'll see that it's not resolved at all. –  Kappei May 22 '12 at 10:40
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