[Python] Upload a file to FTP over TLS with Python is failing with "[Errno 10054] An existing...

I'm trying to make Python uploading files on a FTP server. The code is following:

... ## setting values to variables: ftp_site, ftp_port, ftp_user, ftp_pwd, output_file_name, output_file
import ftplib
ftps = ftplib.FTP_TLS()
ftps.connect(ftp_site,ftp_port)
ftps.auth()
ftps.login(ftp_user,ftp_pwd)
ftps.prot_p()
ftps.storbinary("STOR " + output_file_name,open(output_file,'rb'))
ftps.quit()


It used to work fine earlier, but now I get the following error:

error: [Errno 10054] An existing connection was forcibly closed by the remote host
​

I get the error on the line

ftps.storbinary("STOR " + output_file_name,open(output_file,'rb'))


The Python version is 2.7. I've been looking through similar topics but nothing helps. Could anyone tell how to make it work please?

I can upload a file from this machine to the server using through TCM/FileZilla. Moreover, I can rename a file on the server using Python with this command:

ftps.rename('a.txt', 'b.txt')


So that's not an access issue.

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