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This issue is typically caused by a connection error. Before trying the following steps, check the BlizzardCS Twitter and Realm Status page for any service interruptions. Try the following steps to resolve this error.

1. Reset your network devices to make sure your router hasn't become flooded with data.
2. If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
3. Update your drivers and operating system to resolve any compatibility issues.
4. Close all other applications to resolve software conflicts and free up resources.
5. Update or Modify your security programs, which may mistakenly identify the login module as a security threat.

If the previous troubleshooting steps didn't resolve the problem, you can ask the Blizzard player community for help on the tech support forums (if available) or other community gaming sites. Local computer or network technicians may also be able to help if you've exhausted all other resources.