To change the OpenSSH service password in Windows Server 2008, perform the following steps:
1. Right-click Computer and choose Management.
2. On the Server Manager page, choose Configuration > Local Users and Groups > Users.
3. Right-click ossuser and select Set Password in the right pane.
4. On the dialog box that is displayed, click Proceed.
5. On the dialog box that is displayed, enter the new password and click OK.