Error 500/503 is an HTTP status code that indicates a generic error, such as a corrupted file or a web server is temporarily unavailable.
If you receive the error message in an Avira Antivirus user interface, please perform a repair installation of your Avira product.
If you still receive the error message after the repair installation, verify if your internet connection is working properly.
Note
If the problem persists, and you are using a paid Avira consumer product, please contact Avira Support.