I've used the FTP connection manager without an issue several times. I am now using it with a new server & it only works a fraction of the time. At first, I figured the server was awful. But every time it fails, I immediately attempt to log in with FileZilla & it connects me every time in spite of the SSIS failure.
My settings in the FTP Connection Manager are:
Time-out (in seconds): 60
Use Passive mode: Yes
Retries: 100
Chunk size (in KB): 1
It seems to me that this is already as lenient as I can make it. Is there anything else I can do to assure that the file is uploaded?