The Blizzard Battle.net desktop app can't confirm that it has a secure connection to the Blizzard servers.
- Press reload to refresh the page. If the issue persists, restart the client to clear up any temporary issues.
If you're using a wireless connection, optimize your internet connection to rule out a connection issue.
Run a security scan to remove any viruses or malware infections.
Run Software Update to check for pending updates to software, drivers, and firmware.