Internal error while connecting to Battle.net

My game frozen in the middle of the fight. I had to exit the game by using the exit game option of the game menu. When I tried to log back in to continue, I started getting this message “Internal error while connecting to Battle.net” after authenticating message. I can log in to my WoW account and play my toons there without this problem on the same account. However, I cannot get authenticated with HotS. Guide me to fix this please.

Same thing happened to me around the same time, so it’s definitely just on their end. It’s working now for me.