I’ve been starting to see this pop up recently and this happened to me last night as well. Loaded up D2 everything was fine clicked on what character I wanted and boom. White screen followed up by a connection issue error. The next steps I took to get the issue solved was closing the game and loading it back up. Took me five attempts and then I was able to get back in. I don’t know if it will be the same for everyone. I saw another post here in the help forums and others were reporting the same for that fix. I do hope this helps. If it does spread the word and good luck. 👍🏻