It has to be a problem on Blizzards end. But this is a strange one. I hope they get it fixed soon.
thanks a lot, this is kinda bad news. I am still hoping for a quick solutions.
At least now we know, that we can’t do anything about it and have to wait for blizzard to fix that issue
Thank you for the feedback! One less thing to go crazy behind. Probably some accounts have been flagged to reduce traffic on the network…
that would be really bad… well i will just go for my morning routine, go to the grocery store and will check back in 1-2 hours.
wondering if this is related to the D4-Version that was bought. but I assume that laluin and her husband bought the same version right?
i am having this issue witht he ultimate version.
Same issue as @Laluin I keep getting the 34203 error on my account but my husband has no issues logging in on the same network.
I have restarted numerous times, ran a repair and uninstalled and reinstalled and still getting the same error for the last 3 hours.
Edit to add - Logged in on my account on his pc same error. Logged in with his account on my pc no error. So the error is definitely tied to the account somehow.
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The entire morning I see the error code 34203 and no help or response. Sad.
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Think about it why should they do that. They want to stress the servers. So that this would not happen when they release the game. But I think this will happen anyway when it is release time. And if they did flag accounts to prevent a login then they will lose pre-orders. You can still give the game back at the moment.
Code 34203 all morning, annoying. Brings me back to D3 days, 11 years later and they still can’t run a stable server.
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if you read the last posts, you might have read, that it’s actually not the servers
Correct, we both bought the ultimate edition.
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34203 for 4 hours flat. trying every 5-10 min. 0 response from devs for 5+ hrs.
well done?
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I solved this error by using the google DNS server 8.8.8.8
Thanks for the info. I already tried that and it did not help.
Same here and that’s why I didn’t have any hope for this weekend to play. Plenty other stuff to do 
I try to log every 2-4 minutes since 9h and error 34203…
My friend arrived there is 5 min and log without problem…
Removed
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As we found out, this is a Battle.net-Account related problem - some accounts have the issue, some not…
@Snetch: Using Google-DNS-Server didn’t work for me.
Same problem here… tried several times same error
I wonder why this is set up like this…
It’s a shame to spend nearly £100 on the ultimate edition to not be able to play…
both on PC and PSN 
I feel a little fleeced out of cash now…
I have played game without problems for almost 6 hours yesterday. I had DC after 23:30 and i can’t login untill that time. Spaming “Play” for 1h between 7:30 and 8:30 error “34203”. Trtied to login right now, same error. My brother entered game after 8:00 and he is still playing. Its not high traffic problem. There are almost no queues right now. Just something is f****ed up with accounts. But it was fine 24h ago…
That’s just sad, no queue, no server problems and no one from blizzard to comment here about the error. Been trying irregularly since eight this morning. All attempts to fix it with a scan and fix, reinstall etc have not worked.