# Changing the OPC UA user password

If you do not allow anonymous access, OPC UA Clients can access the OPC UA Server only with user authentication.

The default login data are:

- Username: opc-ua-user
- Password: Detmold

In order to prevent unauthorised access you should change the password immediately. Observe the individual data security regulations of your company.

The user password must contain at least 6 characters.

1. In the Authentication settings, click the Change password button.
2. The Change password dialogue is displayed.
3. In the New password text box, enter the desired password.
4. In the Confirm password text box, enter the password again.
5. Click Change password.

Allowing anonymous access to the OPC UA Server