I'm trying to upload file into FTPS server (Wing FTP Server / Cerberus FTP Server 8) with following script. But I keep getting this error. This is FTPS server log. Can anyone tell me what is wrong?!! PS: I don't know it matters or not but i can easily download from this FTPS server and only cant upload into it.

Error after FTPS transfer finishes with Python ftplib

I’m trying to upload file into FTPS server (Wing FTP Server / Cerberus FTP Server 8) with following script.

from ftplib import FTP_TLS
ftps = FTP_TLS('192.168.133.69')
ftps.login('1011', '7c52xK9')      
ftps.prot_p()
filename = 'upload.pdf'
myfile = open(filename, 'rb')
ftps.storbinary('STOR %s' % filename, myfile)
myfile.close()
ftps.close()

But I keep getting this error.

line 7, in <module>
    ftps.storbinary('STOR %s' % filename, myfile)
  File "C:Python27libftplib.py", line 769, in storbinary
    conn.unwrap()
  File "C:Python27libssl.py", line 823, in unwrap
    s = self._sslobj.shutdown()
error: [Errno 0] Error

This is FTPS server log.

[04] Thu, 02 Feb 2017 19:41:23 (0000062) 220 Wing FTP Server ready... (UNREGISTERED WING FTP SERVER)
[03] Thu, 02 Feb 2017 19:41:23 (0000062) AUTH TLS
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 234 AUTH command OK. Initializing TLS connection.
[03] Thu, 02 Feb 2017 19:41:23 (0000062) USER 1011
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 331 Password required for 1011
[03] Thu, 02 Feb 2017 19:41:23 (0000062) PASS **********
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 230 User 1011 logged in.
[03] Thu, 02 Feb 2017 19:41:23 (0000062) PBSZ 0
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 200 Command okay. PBSZ=0.
[03] Thu, 02 Feb 2017 19:41:23 (0000062) PROT P
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 200 Encrypting Data Channel.
[03] Thu, 02 Feb 2017 19:41:23 (0000062) TYPE I
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 200 Type set to I
[03] Thu, 02 Feb 2017 19:41:23 (0000062) PASV
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 227 Entering Passive Mode (192,168,133,69,4,21)
[03] Thu, 02 Feb 2017 19:41:23 (0000062) STOR upload.pdf
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 150 Opening BINARY mode data connection for file transfer.
[04] Thu, 02 Feb 2017 19:41:23 (0000062) 226 File received successful. Transferred:0Bytes;Average speed is:0.000KB/s

Can anyone tell me what is wrong?!!

PS: I don’t know it matters or not but i can easily download from this FTPS server and only cant upload into it.

Thanks in advance

I tried with FileZilla as “Martin Prikryl” suggested and now I have following error.

line 7, in <module>
    ftps.storbinary('STOR %s' % filename, myfile)
  File "C:Python27libftplib.py", line 760, in storbinary
    conn = self.transfercmd(cmd, rest)
  File "C:Python27libftplib.py", line 376, in transfercmd
    return self.ntransfercmd(cmd, rest)[0]
  File "C:Python27libftplib.py", line 713, in ntransfercmd
    server_hostname=self.host)
  File "C:Python27libssl.py", line 363, in wrap_socket
    _context=self)
  File "C:Python27libssl.py", line 611, in __init__
    self.do_handshake()
  File "C:Python27libssl.py", line 840, in do_handshake
    self._sslobj.do_handshake()
SSLEOFError: EOF occurred in violation of protocol (_ssl.c:661)

This is FileZilla server Log.

(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> Connected on port 21, sending welcome message...
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> 220-FileZilla Server 0.9.59 beta
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> 220-written by Tim Kosse (tim.kosse@filezilla-project.org)
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> 220 Please visit https://filezilla-project.org/
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> AUTH TLS
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> 234 Using authentication type TLS
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> TLS connection established
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> USER 1011
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> 331 Password required for 1011
(000002)2017/02/03 11:00:54 ق.ظ - (not logged in) (127.0.0.1)> PASS *******
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> 230 Logged on
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> PBSZ 0
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> 200 PBSZ=0
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> PROT P
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> 200 Protection level set to P
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> TYPE I
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> 200 Type set to I
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> PASV
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> 227 Entering Passive Mode (127,0,0,1,231,157)
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> STOR upload.pdf
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> 150 Opening data channel for file upload to server of "/upload.pdf"
(000002)2017/02/03 11:00:54 ق.ظ - 1011 (127.0.0.1)> 450 TLS session of data connection has not resumed or the session does not match the control connection
(000002)2017/02/03 11:02:54 ق.ظ - 1011 (127.0.0.1)> 421 Connection timed out.
(000002)2017/02/03 11:02:54 ق.ظ - 1011 (127.0.0.1)> disconnected.

Answer

It’s probably some firewall/NAT/proxy on the way between you and the server that interferes with the transfer connection.

As the problem seems to happen during teardown of the TLS/SSL connection, after an actual transfer finishes, some clients may simply choose to ignore the error (or they do not even notice it).

Related question with some workarounds:
ftplib storbinary with FTPS is hanging/never completing

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Answer