The ease of use, it's fast, easy for even novice users. It is very reliable as well and never crashes or gives me any errors when transferring files between my computer and our servers. I honestly cannot think of anything wrong with this program other than maybe having some better tutorials/guides available in order to get started quicker. As long as you have someone who knows how to set up your server correctly, there should be no problems using core ftp. We are able to easily upload large amounts of data from multiple clients at once without causing lag time problems.
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