Hi Ruben,
Make sure that you connected to the SYSTEM DB.
You can also try to connect to SYSTEM DB with hdbsql:
hdbsql -i <instance_number> -n <host>:<port> -d SystemDB -u SYSTEM
Then you will be asked to change the password for user system of SYSTEM DB again according to the default password policy (although you have reset the password with command hdbnameserver –resetUserSystem).
Regards,
Ning Tong