back
If the connection could not be established due to authentication problems, the user name and password prompt appears again.
In this case, please check the following points:
Have you entered the identifier (s-**) and your password correctly?
Is a connection already active under the identifier? Only one connection can ever be established under the same identifier; further connection attempts will be rejected. After unexpected disconnections, it may take a few minutes before a new connection can be established.
Are you using the correct profile for your identifier?
Are other programmes active that can influence your configuration through live monitoring (e.g. firewalls such as Kaspersky and Avira Antivir, CCleaner, …)?
Try the connection again after a few minutes; there may have been a temporary system problem that has since been resolved.
Deutsche Version: VPN - Mögliche Probleme