Unable to login to a character or characters
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Make sure that the realms are up by checking maintenance and service interruptions at our BlizzardCS Twitter.
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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.
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Missing or corrupted game files can also cause connection issues. Run the repair tool to check for these problems.