You may also need to take these steps if you get the message: Warning - Potential security breach!
Windows Users:
WinSCP Portable executable
Look for the file “winscp418.ini” located in you WinSCP directory.
Find [SshHostKeys].
Then look for the line that starts with rsa2@22:then has your current iPhone IP Address.
Delete that line and save.
Now try to log in again and accept the new key. [...]

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