Error Message: You've failed to connect to the authentication server.

reinstalling wont fix this problem, maybe restarting the game but i dont see why you would need to reinstall..its an issue within the game itself(server side of things), similar to how when your game crashes and closes itself for no apparent reason..its just glitchy at times i believe..

I have the same issue, did you find a solution by any chance?

did you read my response by chance? it is not an issue within your installed game, it is a server side issue..*smh*

How do you fix the issue?

Launch DBOGLauncher.exe and it will patch the client.

i thought that was just part of mantience

I have the same problem: https://scr.hu/3ylh/t2aea
And I can't launch DBOGLauncher.exe cuze it's say that program ll not working in my pc,too find version for u'r pc contact
software publisher. Any idea how too fix that,i did reinstall game not working.