SCX install issue: Could not transfer the discovery script. (2)

Another error like the first one but different error details:

< ![CDATA[Executing command: rm -rf /tmp/scx-myactionaccount; mkdir -m 755 /tmp/scx-myactionaccount

Server sent disconnect message: type 2 (protocol error : Too many authentication failures for myactionaccount)
Could not create secure folder
]]>

Can you log on locally with this user?
Is SSH activated and configured correctly?

All information is provided "as is" without any warranty! Try in lab before. Handle with care in production.