What are the prerequisites for scp mode image transfer to cisco 3850 via prime 3.2

[Krishna420]

Trying to push the Image via Prime using scp protocol to cisco 3850 getting below error

Flash Validation successfully completed.Loading Image File to Device : Copying image cat3k_caa-universalk9.XXXXXXX.bin to the flash flash: failed. Unable to establish the connection with the device because authentication failed on the device or the connection timed out. Update the device credentials in Network Devices and retry the task..

i dont see scp server configured in my Prime infra

Administration / Servers / TFTP/FTP/SFTP Servers

Let me know how to add scp server what are requirements to do it

[marce1000]

 - You need to make sure the 3850 is configured to allow ssh connections :

https://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/4145-ssh.html

M.