The solution depends on the operating system which your Netprobe is running on.
Linux and Unix Netprobe
The Netprobe startup script does not include a default password. This means the password will be null, which cannot be used as in the Netprobe command.
The password can be specified in Gateway Setup Editor, or inside the Netprobe startup script with the ENCODED_PASSWORD environment variable.
If security is not a concern, the Netprobe executable may be launched with the command line option -nopassword. This will allow commands to be able to run on the Netprobe without any prompting for a password.
If the Netprobe is installed as a service with default options, it would have a default password of 'killer'. This password is stored in the Windows Registry.
The password can be specified in Gateway Setup Editor, or updated in the Windows Registry under the name ENCODED_PASSWORD.
If security is not a concern, user can create a NOPASSWORD key in the Windows Registry and set its value to true.
Users can refer to the documentation Set passwords on Netprobe commands.