If you face with the following “An error has occurred. Please try again later. (BLZ51903003)” message, in this article you will find all possible solutions on fixing this issue.
Method 1: Flushing Domain Name Server (DNS).
Type “ipconfig /flushdns” and press Enter
Close command prompt window and try to Login again without BLZ51903003 World of Warcraft Login Error.
Method 2: Creating New account.
Just create new account to ge rid of BLZ51903003 World of Warcraft Login Error.