" HS: NGRESULT DB ERROR: 303: 0 "
For a many days in a row I can not enter the game because of this error!
It is intimidating that the problem has been around globally for several months, and few can boast that the problem has been truly solved.
Do not consider advice on creating a new account. Although I also play on PC, I still play on my phone more often and the problem extends not only to the PC, but also to the phone.
This forum is to report bugs on the Battle.Net Mobile App… not to report game specific issues.
The issue you are writing about is already under investigation… see this topic on the Europe region Hearthstone Technical Support forum: