SFTP transfer makes file corrupt

Hi

From time to time we have to transfer pdf files to another company.
Before we used WinSCP version 4.? on Windows 7 SP1 x64.
After software update of our hardware firewall sometimes we got an error,
that the file could not be transfered.
Then we updated WinSCP to version 5.1.4 build 3020 and the problem went away.
Everytime the files can be transfered now but then we got another problem.
The other company either can not open the files or can not print because the files
somehow getting corrupt.
For transfer we use SFTP-3 and in WinSCP we use commander GUI.
For testing i used another SFTP software, for example Filezilla Client and with that we
got no problems.

dominik

Does it happen with every transfer?
Please attach a full log file showing transfer that corrupts a file.

hi martin

yes this happened with every transfer. I just sent you an email with the log file.

cheers
dominik

You are uploading the file in ASCII/text mode. PDF files are binary files. Make sure you are using binary mode (what is default, btw).
https://winscp.net/eng/docs/transfer_mode

that was the solution. thank you for your support.