Able to connect to Heroes of the Storm; Unable to enter game
1. Make sure that the service is up by checking maintenance and service interruptions at our BlizzardCSEU_EN Twitter.
2. Assuming the servers are up, the main cause for this issue is corrupted game cache data. You can delete this data to resolve the problem. The game will rebuild it properly as you play.
3. Missing or corrupted game files can also cause connection issues. Run the repair tool to check for these problems.