Symptom

A backup of the Firepower Management Center (FMC) completes with "Backup complete, Copy failed" as its final status. The backup log (/var/log/backup.log) on the FMC shows "Error SCPing backup" as an error and the following as text of the SCP error... ---- Problem performing scp: ^MThe authenticity of host '[domain/IP] ([IP])' can't be established. [key algorithm] key fingerprint is [fingerprint]. Are you sure you want to continue connecting (yes/no/[fingerprint])? ---

Conditions

"Remote Storage Device" in the FMC configuration set to "Local (No Remote Storage" (no systemwide remote storage configured at all). Use of the "Copy when complete" component within a FMC backup profile. The FMC has never before connected via SCP/SSH to the configured remote host (IP address or domain name).

Workaround

Use the following procedure to ensure that the FMC has the remote SSH/SCP host's key fingerprint prior to copying a backup file to that host as part of the backup profile: --- 1. Log into the CLI of the FMC. 2. Go to expert mode: expert 3. Initiate a connection to the SSH/SCP server as the FMC's root CLI user (enter the current CLI user's password at the "Password:" prompt): sudo ssh -l [remote user] [remote host ip] 4. At the "The authenticity of host..." prompt, type yes and press Enter. (This puts the key fingerprint into the /root/.ssh/known_hosts file.) 5. Press Control+C to break the SSH client process and connection. --- Repeat steps 3-5 as necessary for additional remote hosts.

Further Problem Description