I'm a web developer and a few weeks ago I started to see a weird issue when uploading files to a server via FTP.
Some files, apparently randomly, are being uploaded as 0kb empty files. At first I thought my client's server was the issue, but it keeps happening with several other servers including my own which is pretty high end and has never had a similar issue.
If I re-upload the empty files, they are uploaded just fine, which leads me to believe it is an intermitent problem, but then if I overwrite the whole thing, some other different files are uploaded as blank. I've been manually looking for the 0kb files and replacing them individually but that's no fun when you have a 1,000 files CMS with lots of folders.
I've tried different FTP clients and it keeps happening. I thought my hard drive could be the problem so I tested using an external drive and uploading from there. Same problem.
Cyberduck returns a PASV 450 (action not taken) error.
I read it could be a network issue and followed the instructions to change the network's MTU to 1300 with no luck either.
I'm running OS X 10.8.2.