"Connection timed out" error when trying to move files on my FTP server.

I set up an FTP server using Synology DiskStation 1515+. The idea is for clients to be able to connect to the FTP via an external IP address and move files to and from it. I can connect to the FTP using said external IP and browse files with no problems. However when I try to move multiple files at once it starts the process and then stops it and gives me the following error message:

"An error occurred copying a file to the FTP server. Make sure you have permission to put files on the server. Details: The operation timed out."

It sometimes allows me to move individual files but its not very consistent. I can also connect to the FTP using its local IP and move files anyway I want with no problems.

Any help would be appreciated.
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ANTUSASupportAuthor Commented:
I solved it! So I believe the problem was that I was trying to access the FTP externally from within the Internal network which apparently causes it to think its a virus attack. I disconnected from my LAN and onto another internet source and everything started working!

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