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ich vermute dies kann helfen:

9.11 Using Credentials from a netrc File

To enable the usage of a .netrc file (Linux and Mac) or a _netrc file (Windows), go to the IBM i Access Client Solutions main GUI and from the menu bar, select
Edit->Preferences
General tab
Check the box: Read netrc file for login information
Click the Apply button
Restart IBM i Access Client Solutions

The standard format of a netrc file is:

machine <system> login <user-id> password <password>

The netrc file must be stored in the user's home directory and the system name and user-id must match System Configurations. From IBM i Access Client Solutions:
Select System Configurations
Select and then Edit the system
Connections tab
Select Use default user name to prompt once for each system
Fill in the user-id for: Default user name
Select OK

When the system name and Default user name match the contents of the netrc file, a connection to the system will be made using the password from the netrc file without prompting the user.