Had a problem a few days ago with that error 39500 and with 300016, and I solved it. Problem is, a lot of people on Battlnet in settings put that when they enter into game to leave Battlnet,I had that option too, I changed when I enter in-game, to keep my Battlnet online
Same issue here - can’t connect same error message
Hello folks,
If you’re experiencing 39500 or 300016 please long into account management and change your password:
https://account.blizzard.com/security
Once done, try logging into the battlenet app again, and then Diablo 3.
Please report success/failure in this correction.
Okay, thank you. While it sounds odd, please try changing your password, but change it to exactly 16 characters long.
After years away from gaming I thought Id fire up Diablo 3 today… seems Blizz still dosnt run right after all those years.
D3 downloaded, Error code 300016. changed password, still not working, changed it to 16 chars, still no…
Want players to return? fix this please. Otherwise it will be another 5 years before I bother to try and log in again.
Edit: same thing happening on wife’s account
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Awesome support… thanks for ignoring. bye.
I change my password game is now work but I played maybe 3-5 minutes and error code 1016 disconnected me so I log out and log in and this error code in an instant jump on me every time so what to do next
300016 error still occuring. Europe server.
same here
if i change region to americas it works
Hello! Could you try logging in now please and let us know if it’s okay for you? Thank you folks 
[edit] To be clear, the problem should be resolved now, and a password reset shouldn’t be needed.
I had the same problem. Changing to a 16-character password indeed solved it for me. As an IT-professional though, I have to say that’s a very strange solution. But oh well, I guess as a method to get people to choose long passwords, it certainly works 
same problem here, i tried everything everyone else have tried and nothing has worked for me. i changed server from eu to us that worked but my characters are on EU server, achievements also
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it still throws the 300016 error for my account when it comes to “loading hero list”.
tried to change password to one with 16 chars, restarted battle.net app but it wont work -.-
ps: it works on US realm, but not for EU
Also tried all of the above fixes, still getting 300016. Can connect to US, but not EU
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Thank you for letting us know Finslayer, zolex, and Frosty. Your reports have been escalated, and we ask that you try logging again in after resetting your battle.net password.
Hello,
In the middle of the game it was terminated, trying to get back in get the error 95002, google it, saying its when you revive someone, we were all in town when this happen. since then can’t get back, and did all the steps that is mention on (Error 395002 - Blizzard Support) still nothing. I am not a HC player because of things like this that happen, I would think if its a problem on the provider side they will be a little considered and compensate the players when they lose their hero’s … not sure what else to do as it seems nothing is working 
Yes… this is affecting only the Americas server.
That was your mistake… instead, head over on NA’s Technical Support forum.
i was there as well, that where i got this post
i did google, as well as checked on the forums and did all that was suggested here as well Error 395002 - Blizzard Support. and waited and just tried again still same code