FTP upload no data error - ftp

Question

I'm getting a weird error that only appears when I try to run this code on a Linux server, but it works perfectly on my local Mac. I'm not sure if anyone else has ran into this issue and can give me insight.
import ftplib
import sys, os
files_to_drop = set()
server = ""
username = ""
password = ""
ftp_connection = ftplib.FTP(server, username, password)
remote_path = "/incoming/"
ftp_connection.cwd(remote_path)
local_path = '/var/www/analytics/'
def deliver_via_ftp():
fh = open(local_path + files_to_drop[0], 'rb')
ftp_connection.storbinary('STOR {}'.format(files_to_drop[0]), fh)
fh.close()
The error I'm receiving on the Linux machine is below:
*cmd* 'CWD /incoming/'
*put* 'CWD /incoming/\r\n'
*get* '250 Directory successfully changed.\n'
*resp* '250 Directory successfully changed.'
starting to drop files.
*cmd* 'TYPE I'
*put* 'TYPE I\r\n'
*get* '500 OOPS: vsf_sysutil_recv_peek: no data\n'
*resp* '500 OOPS: vsf_sysutil_recv_peek: no data'
Traceback (most recent call last):
File "manage_batches.py", line 258, in <module>
m.run()
File "manage_batches.py", line 253, in run
self.__deliver_via_ftp()
File "manage_batches.py", line 215, in __deliver_via_ftp
self.ftp_connection.storbinary('STOR {}'.format(file_name), fh)
File "/usr/lib/python3.5/ftplib.py", line 502, in storbinary
self.voidcmd('TYPE I')
File "/usr/lib/python3.5/ftplib.py", line 277, in voidcmd
return self.voidresp()
File "/usr/lib/python3.5/ftplib.py", line 250, in voidresp
resp = self.getresp()
File "/usr/lib/python3.5/ftplib.py", line 245, in getresp
raise error_perm(resp)
ftplib.error_perm: 500 OOPS: vsf_sysutil_recv_peek: no data
I found a thread here (https://github.com/mscdex/node-ftp/issues/50) regarding the problem, but seems to point to repeatedly opening and closing of the connection. I'm reusing the same connection for all files and it works on my Mac.
Debug trace on Mac:
*cmd* 'CWD /incoming/'
*put* 'CWD /incoming/\r\n'
*get* '250 Directory successfully changed.\n'
*resp* '250 Directory successfully changed.'
*cmd* 'TYPE I'
*put* 'TYPE I\r\n'
*get* '200 Switching to Binary mode.\n'
*resp* '200 Switching to Binary mode.'
*cmd* 'PASV'
*put* 'PASV\r\n'
*get* '227 Entering Passive Mode (<hidden IP>,11,133).\n'
*resp* '227 Entering Passive Mode (<hidden IP>,11,133).'
*cmd* 'STOR 11062017_0812_AM.txt'
*put* 'STOR 11062017_0812_AM.txt\r\n'
*get* '150 Ok to send data.\n'
*resp* '150 Ok to send data.'
*get* '226 Transfer complete.\n'
*resp* '226 Transfer complete.'
file dropped /Users/f/Desktop/bucket/11062017_0812_AM.txt
Can someone point me in the right direction?
Thanks
EDIT: I cleaned up the code to remove the class structure and I added the debug output set to level 2.