> Source: [sk91461](https://support.checkpoint.com/results/sk/sk91461)

# sk91461 - Backup stopped working after changing the remote SCP server IP address

| Property | Value |
|----------|-------|
| Solution ID | sk91461 |
| Date Created | 2013-01-22 |
| Last Modified | 2018-06-15 |
| Technical Level | General |
| Products | Security Gateway, Security Management Server |
| Versions | R82.10, R82, R81.20, R82.10, R82, R81.20, R82.20 |

## Symptoms

- The backup stops working - the scp command fails with "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY! Someone could be eavesdropping on you right now (man-in-the-middle attack)! It is also possible that the RSA host key has just been changed. The fingerprint for the RSA key sent by the remote host is. Please contact your system administrator. Add correct host key in /root/.ssh/known_hosts to get rid of this message. Offending key in /root/.ssh/known_hosts:1RSA host key for has changed and you have requested strict checking.Host key verification failed.lost connection".

## Cause

The RSA host key in */root/.ssh/known_hosts* file was changed.

## Solution

To resolve the problem, perform the following from expert:

1. To find the known_hosts file, run:*# find / -name known_hosts*
2. To replace the known_hosts file, run:*# find / -name known_hosts -exec bash -c 'mv -v "$1" "${1%/\*}"/known_hosts.old' -- {} \\;*
3. Run the backup again; it should complete successfully.

In VSX systems, this needs to be done only in the context of VS0.

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