Systems, devices and techniques for establishing a secure file transfer session for secure downloading of configuration files to a Demarcation device are disclosed. Communication is established with a first network device. A password challenge message is received from the first network device. A username is generated. A password is generated using the password challenge message and a locally stored salt key. The username and the password are communicated to a second network device via the first network device, to facilitate establishing a secure file transfer connection with the second network device.