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[Mr.Mag]

Diablo 3 Error 12
- This is definitely an error we're nonetheless investigating , you can workaround that by basically changing your own Battle.net account password to push your account information to refresh. When changed you'll be able to change this back.

Diablo 3 Error 33 and 34200 - The service is going through maintenance, make sure you try once again later.

Diablo 3 Error 37 - The host is full. This is probably due to many connection at the same time, wait for a moment and try again.

Diablo 3 Error 24000 - you could possibly run directly into this error when trying to start a game title. We're curious and work to deal with it as soon as possible.

what is Diablo 3 Error 3003, Diablo 3 Error 75 - server is outage, the server is down for maintenance or because of too bussy or maybe because account change of your own region.

Diablo 3 Error 3004
diablo 3 error 3006, 3007, or Diablo 3 error 300008 - These are common problem of timeouts because of too many connections . These usually are server-side issues. There are not any workarounds with regard to these glitches except to test again. and hope the server may work better with larger capacity.

Error 108
Similar to “An unexpected decryption error occurred”, the error 108 can be caused by corrupted, damaged or incomplete installation files. This can often times be caused by closing the downloader early. Though the downloader may show 100%, please allow some time for it to fully complete.

More "diablo 3 error codes"
Diablo 3 Error 315300
- this is problem in realtionship with account information, verify to ensure no further spaces were added ahead of or right after your email. it could be error in your own foreign vocabulary appdata data files.

Error 12 - No license attached
People in Asian regions with a digital version of Diablo 3 have been receiving this code. Blizzard's Game Masters can manually flag accounts to fix this. There is no other solution at this time.

Diablo 3 Gray login button
- You should utilize your Battle.net email target as the account name. Your own BattleTag is a nickname, not your account name.
Not any Licence Attached - Please convey a Battletag to your account
Updating Setup Files problem -
Failures - For any kind of crashes please visit the Technical Support forum or even Mac Technical Support

Conclusion :
Many of errors because of too many connections (error 37), you can imagine there are more then million gamers from all over the world and connect at the same moment to the same server which is battle.net. it makes server bussy, and then server is outage (error 75) or shut down for maintenance (error 33). the best solution to solve error because of server side erreur like this is to upgrade server and internet bandwith capacity. we are waiting battle.net to upgrade and improve their servers.

what we can do is try to find lower traffic maybe in the morning. or you can try to ping -t to server while connecting.

Źródło
http://www.howtocircle.com/2012/04/diablo-3-error-codes-solution-guide.html
http://thecontrolleronline.com/2012/05/some-common-diablo-3-error-codes/