Also, it affects both Retail and Classic WoW, on all realms.
same boat here, cant log in to retail or classic. automatically getting sent to main screen with disconnect message \o/
Everyone I know is managing to log on to Pyrewood, i’m the only person who can’t seem to log on. Tried firewall settings and everything and it just doesn’t wanna work. The one time I have free time and want to play, this happens 
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Still not working, got dced and keeps giving this error after choosing the Realm… T_T
i am from Pyrewood as well.
A friend of mine just log in from another pc to my acc and vouala,is in!!!so,the problem is from our pc
Maybe it has something to do with blizzard fighting DDOS attacks. Seems like it only occurs when the game gets closed unnaturally? So maybe it thinks our connection is an attack?
well, no wonder classic is hard to level up. servers are always down. 
Getting the same error.
Trying to login to a realm leaves me stuck on loggin in to game server for a while and then gives me error WOW51900328 done everything from rebooting PC to reinstalling game twice and disabling firewall.
running game via wine.
Why can we not log in? my friends are able to login.
I have the same problem
I think maybe Blizzard have been a bit militant with the DDOS protection. Wouldn’t be surprised if several connections are being flagged as attacks so being blocked… It makes sense as error 51900328 usually means you have something blocking the connection.
Time: 2019-09-08 19:22 GMT - Ongoing at time of post
Location: West Yorkshire, UK
ISP: Virgin Media
mtr output:
$ mtr -w 185.60.112.157
Start: 2019-09-08T21:46:25+0100
Loss% Snt Last Avg Best Wrst StDev
1.|-- [redacted] 0.0% 10 10.1 11.3 9.4 14.0 1.5
2.|-- brad-core-2a-xe-520-0.network.virginmedia.net 0.0% 10 12.0 11.7 10.6 13.5 0.9
3.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
4.|-- 86.85-254-62.static.virginmediabusiness.co.uk 0.0% 10 20.2 22.1 18.6 31.1 4.2
5.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
6.|-- uk-lon03a-ri1-ae5-0.aorta.net 0.0% 10 20.9 20.7 19.8 21.9 0.6
7.|-- 213.46.175.254 0.0% 10 58.5 27.3 20.2 58.5 13.3
8.|-- ae1-br02-eqld5.as57976.net 0.0% 10 29.4 33.8 28.4 60.4 10.0
9.|-- et-0-0-2-br02-eqpa4.as57976.net 0.0% 10 30.7 32.3 29.1 37.0 2.7
10.|-- et-0-0-3-br02-eqam1.as57976.net 0.0% 10 29.5 31.4 29.1 46.3 5.3
11.|-- et-0-0-67-pe02-eqam1.as57976.net 0.0% 10 31.0 30.4 29.0 34.7 1.7
12.|-- 137.221.66.47 0.0% 10 29.8 30.3 29.3 31.4 0.7
13.|-- 185.60.112.157 0.0% 10 29.5 30.3 29.5 32.1 0.9
$ mtr -w 185.60.112.158
Start: 2019-09-08T21:47:37+0100
Loss% Snt Last Avg Best Wrst StDev
1.|-- [redacted] 0.0% 10 11.5 11.5 9.2 17.9 2.4
2.|-- brad-core-2a-xe-521-0.network.virginmedia.net 0.0% 10 12.0 12.7 9.9 22.7 3.7
3.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
4.|-- 86.85-254-62.static.virginmediabusiness.co.uk 0.0% 10 20.6 19.5 18.2 20.6 0.7
5.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
6.|-- uk-lon03a-ri1-ae5-0.aorta.net 0.0% 10 21.0 21.3 19.3 26.6 2.0
7.|-- 213.46.175.254 0.0% 10 20.9 22.3 20.1 27.0 2.0
8.|-- ae1-br02-eqld5.as57976.net 0.0% 10 31.2 32.2 28.5 49.9 6.3
9.|-- et-0-0-2-br02-eqpa4.as57976.net 0.0% 10 30.4 35.6 28.4 85.3 17.5
10.|-- et-0-0-3-br02-eqam1.as57976.net 10.0% 10 29.5 33.7 29.1 45.5 6.1
11.|-- et-0-0-67-pe02-eqam1.as57976.net 0.0% 10 30.4 40.2 29.2 82.7 21.1
12.|-- 137.221.66.45 10.0% 10 31.2 31.0 28.1 41.0 4.0
13.|-- 185.60.112.158 0.0% 10 29.4 28.7 28.0 29.4 0.5
$ mtr -w 185.60.112.159
Start: 2019-09-08T21:48:00+0100
Loss% Snt Last Avg Best Wrst StDev
1.|-- [redacted] 0.0% 10 10.1 11.1 9.4 19.3 2.9
2.|-- brad-core-2a-xe-520-0.network.virginmedia.net 0.0% 10 15.0 12.2 10.9 15.0 1.1
3.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
4.|-- 86.85-254-62.static.virginmediabusiness.co.uk 0.0% 10 18.6 18.9 18.1 20.5 0.7
5.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
6.|-- uk-lon03a-ri1-ae5-0.aorta.net 0.0% 10 25.3 25.9 20.3 30.0 3.0
7.|-- 213.46.175.254 0.0% 10 21.5 28.7 20.8 54.6 13.4
8.|-- ae1-br02-eqld5.as57976.net 20.0% 10 29.7 29.8 28.8 30.6 0.7
9.|-- et-0-0-2-br02-eqpa4.as57976.net 0.0% 10 40.1 35.8 29.0 59.9 9.6
10.|-- et-0-0-3-br02-eqam1.as57976.net 10.0% 10 28.8 32.5 28.6 42.9 5.6
11.|-- et-0-0-67-pe02-eqam1.as57976.net 0.0% 10 29.8 36.0 29.3 92.5 19.9
12.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0I know this is just a temp solution, but perhaps using a VPN could get around this issue? It appears certain ISPs are being blocked, my guess it’s the Blizzard DDOS protection. Use VPN to hide your IP and I bet it will work.
Just to throw another one into the pile. I was playing fine around lunch. Come back to log on tonight and the same problem as you all have.
Sadly it does not. Having the same problem as everyone else in this thread seem to have. And I do not get in by using VPN either.
Exact same problem, went for dinner came back and cant log in. I’ve uninstalled, cleaned cache folders, registry check, created exceptions inside windows defender. also tried tethering from my mobile and still got the error message. Cant think of anything else to try.
WOW51900328 error and IPv6 didn’t work for me either , My ISP : Mayak smart services Ltd.
Tried everything but still not able to login, girlfriend in the same house/network plays without problems…
Got inside again, didn’t do anything!