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. You can follow the directions here: WINSCP GUIDE FOR IPHONE

WinSCP Installation package
BE VERY CAREFUL. READ AND REREAD BEFORE YOU DO ANYTHING. MESSING WITH THE REGISTRY CAN SCREW UP YOUR COMPUTER IF YOU DO SOMETHING WRONG
Click Start
Click Run
Type regedit and then hit return
Navigate to: [HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\SshHostKeys]
Delete only the line that says: rsa2@22:your iPhone’s iP Address
Now try to log in again and accept the new key. You can follow the directions here: WINSCP GUIDE FOR IPHONE

Mac users having trouble with SSH:

Launch Terminal and type “open /Users/username/.ssh/known_hosts”
Then look for the line which has your current iPhone IP Address along with ssh-rsa and ends in “==”
Delete that line and save the file.
Now try to log in again and accept the new key.