Not supported.
Check to ensure you are using supported FTP servers.
While working through the issues here is a workaround:
1) Create a service account
2) Login as the service account
3) Stick in the CD with the file you want
4) mount /mnt/cdrom
or instead of 3 and 4 you can FTP or SCP the file to the service account's home directory.
5) Back in the CLI go to conf t
6) Accept the sensors's ssh key as a server key: "ssh host-key "
7) Now you access the file through the sensor's own scp server for the upgrade or copy command: scp://service@sensorip//mnt/cdrom/filename
replace service,sensorip, and filename with the appropriate values for your sensor.
or if you FTP'd or SCP'd the file to the service account's home directory then execute:
scp://service@sensorip/filename
8) If upgrading from CD then eject the CD before the bootup to prevent booting from the CD
