I had support case #9783103 open for this issue for the current client but the problem still exists in 2.0 EAP.
We are using Sophos Connect Client with Sophos UTM. The user is not able to establish a connection if the username or password contains german Umlaut characters (ä, ö, ü). If the username contains an Umlaut charecter the user get's the error message "connection could not be loaded" in the Sophos Connect client after entering the credentials. If the password contains an Umlaut charecter the user gets an authentication error. It does not matter if the corresponding user object is locally authenticated in the UTM or against a backend like AD.
The client should really be working with these special characters.
BR,
Stephan
