SSH Security Warning Dialog Box　　

The SSH Security Warning dialog box is displayed when the remote host key is not saved in the host key database or when the fingerprints of the saved host key differs from the remote host key.

Accept Once
Accept a host key for this connection only. The host key is not saved and the same dialog box is displayed at the next connection. This is useful when a server host key changes often or the user rarely connects to the server.

Accept and Save
Save host key and process the connection. This dialog box does not open on the next connection. This is useful when the fingerprint is correct and the user connects to the host frequently.

Cancel
Host key is not accepted and connection is cancelled.