"Secure Connection Failed . . . Your certificate contains the same serial number as another"

Restart your browser

This appears to be a false alarm that happens when your GoodCrypto Private Server is rebooted.

If the error shows again after you restart your browser, reboot your own system.

If you see the same error again right after you reboot, it's probably real. Follow the instructions on the screen.

Sometimes this error is temporary. It disappears when you restart your browser or reboot. Or it may be a real attack.