Failed to copy from Local TSource : Expected another server reply(15) : 450 Internal error renaming the file FileZilla
This error kept coming up trying to FTP files to one of my servers. I googled around a bit as nothing had changed in the environment that should have causes this issue. After finding nothing thats looked like the issue I decided to try the old reboot trick. Well it worked. No idea why this happened but after a reboot the problem went away.
I actually came back to this issue and it was because the hard drive filled up completely. Well that was an easy fix.