Hi Martin, I didn't try any other FTP client to upload the file. I have attached the log details below. Please check it.
For security purpose, I have put * for sensitive information.
< 2022-01-03 12:20:13.764 Script: Connecting to ********...
. 2022-01-03 12:20:13.764 Connecting to ********...
. 2022-01-03 12:20:13.787 Connected with ********. Waiting for welcome message...
< 2022-01-03 12:20:13.814 220-
< 2022-01-03 12:20:13.814 ********************************* WARNING
< 2022-01-03 12:20:13.814 This system is for use by authorized users only.
< 2022-01-03 12:20:13.836 ***************************************************
< 2022-01-03 12:20:13.836 220 Proxy first requires authentication
< 2022-01-03 12:20:13.836 Script: Trying to access ******** through ftp proxy...
. 2022-01-03 12:20:13.836 Trying to access ******** through ftp proxy...
> 2022-01-03 12:20:13.836 USER ********
< 2022-01-03 12:20:13.847 331 Please specify the password.
> 2022-01-03 12:20:13.847 PASS *********
< 2022-01-03 12:20:13.870 230 User authenticated to proxy.
> 2022-01-03 12:20:13.870 USER ********
< 2022-01-03 12:20:13.908 331-(----GATEWAY CONNECTED TO ********----)
< 2022-01-03 12:20:13.908 331-(220 Enterprise FTP server (01/03/2022 07:19:54 / Version 3.0.15 Aug 16, 2012)
< 2022-01-03 12:20:13.908 )
< 2022-01-03 12:20:13.908 331 Password required for ************
> 2022-01-03 12:20:13.908 PASS ********
< 2022-01-03 12:20:14.746 230-Signon to mailbox ******** successful.
< 2022-01-03 12:20:14.746 230 Using ASCII mode to transfer files.
> 2022-01-03 12:20:14.746 SYST
< 2022-01-03 12:20:14.769 215 UNIX Type: L8
> 2022-01-03 12:20:14.769 FEAT
< 2022-01-03 12:20:14.792 211 No features.
< 2022-01-03 12:20:14.792 Script: Connected
. 2022-01-03 12:20:14.792 Connected
. 2022-01-03 12:20:14.792 Doing startup conversation with host.
< 2022-01-03 12:20:14.792 Script: Starting the session...
> 2022-01-03 12:20:14.792 PWD
< 2022-01-03 12:20:14.816 257 Sender=************ Receiver=************ APRF=*BINARY
. 2022-01-03 12:20:14.816 Changing directory to "/Sender=************".
> 2022-01-03 12:20:14.816 CWD /Sender=************
< 2022-01-03 12:20:14.840 250 Default receiver: , APRF: *BINARY
. 2022-01-03 12:20:14.840 Getting current directory name.
> 2022-01-03 12:20:14.840 PWD
< 2022-01-03 12:20:14.863 257 Sender=************ Receiver= APRF=*BINARY
. 2022-01-03 12:20:14.863 Startup conversation with host finished.
< 2022-01-03 12:20:14.863 Script: Session started.
. 2022-01-03 12:20:14.863 File: 'C:\sample.zip' [2021-12-27T16:13:44.918Z] [1391528270]
. 2022-01-03 12:20:14.863 Copying "C:\sample.zip" to remote directory started.
. 2022-01-03 12:20:14.863 Binary transfer mode selected.
. 2022-01-03 12:20:14.863 Starting upload of C:\sample.zip
> 2022-01-03 12:20:14.863 TYPE A
< 2022-01-03 12:20:14.887 200 TYPE set to A
> 2022-01-03 12:20:14.887 PORT 3,14,205,231,204,25
< 2022-01-03 12:20:14.912 200 Port command successful.
> 2022-01-03 12:20:14.912 LIST
< 2022-01-03 12:20:14.935 150 Opening ASCII mode data connection for transfer
. 2022-01-03 12:20:15.383 Data connection closed
< 2022-01-03 12:20:15.386 226 Transfer Complete.
> 2022-01-03 12:20:15.387 TYPE I
< 2022-01-03 12:20:15.409 200 TYPE set to I
> 2022-01-03 12:20:15.410 PORT 3,14,205,231,204,26
< 2022-01-03 12:20:15.435 200 Port command successful.
> 2022-01-03 12:20:15.435 STOR ****
< 2022-01-03 12:20:15.459 150 Opening BINARY mode data connection for transfer
< 2022-01-03 12:20:15.499 226-
< 2022-01-03 12:36:08.262 Service Ref# Item Type Item ID Sender/Receiver
. 2022-01-03 12:36:23.987 Timeout detected. (control connection)
. 2022-01-03 12:36:23.987 Copying files to remote side failed.
. 2022-01-03 12:36:23.987 Connection was lost, asking what to do.
. 2022-01-03 12:36:23.987 Asking user:
. 2022-01-03 12:36:23.987 **Lost connection.** ("Timeout detected. (control connection)","Copying files to remote side failed.")
< 2022-01-03 12:36:23.987 Script: Lost connection.
< 2022-01-03 12:36:23.987 Script: Timeout detected. (control connection)
< 2022-01-03 12:36:23.987 Copying files to remote side failed.
Thanks in Advance.