Remote Scan function in version 3.13 and lower versions. In later versions and all versions 4.X does not work.
How do you do if you need to scan from the client?

Safe Mode and SCAN was a good choice. Unfortunately, in version 4.x client disconnects and the result is not know

How to solve it?

How to scan from the client? In version 4.x and higher?

You can use my PHP API class which is able to perform remote scan and post results:

http://wiki.mikrotik.com/wiki/RouterOS_PHP_class

Search for function: function scan($id, $duration="00:02:00", $callback = FALSE)

Kamil

And if one cannot use php class (limited knowledge)?