We get this error from time to time and I'm trying to figure out what may be causing it:
System.Exception: EnterpriseDT.Net.Ftp.FTPException: STOR failed due to local error.
at EnterpriseDT.Net.Ftp.FTPControlSocket.ValidateReply(FTPReply reply, String[] expectedReplyCodes)
at EnterpriseDT.Net.Ftp.FTPClient.ValidateTransfer()
at EnterpriseDT.Net.Ftp.FTPClient.Put(Stream srcStream, String remoteFile, Boolean append)