### FTP Server Configuration ###
ftp.enabled=true
ftp.port=2121
# FTP data port range, a value of 0:0 disables the data port range and will use the next available port
# Valid range is 1024-65535
ftp.dataPortFrom=1433
ftp.dataPortTo=1434
# FTPS support (enabled when the keystore, truststore and passphrase are set)
ftp.keyStore=/alfresco/ftps/keystore
ftp.trustStore=/alfresco/ftps/truststore
ftp.passphrase=alfresco
ftp.requireSecureSession=true
ftp.sslEngineDebug=false
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No other application is setup on this server and the above mentioned port used only for alfresco, we still get this error.