I am working with a customer to troubleshoot an error they have when trying to overwrite/"PUT" a file to our SFTP site. When the root directory is empty and they try to upload the file there is no problem but when they try to overwrite an existing file this is when the error occurs. The error they receive when trying a put command in Java Caps is:

The error is: Batch SFTP eWay error when doing data transfer operation in [PUT()], message=[EOF received from remote side [Unknown cause]].|#]

When they use WinSCP or FileZilla to put the file it overwrites fine with no errors. We have tried:

• Multiple different files
• Checking their SFTP user permissions
• Gave full access permissions to "everyone" to the user's root directory in Windows
• Recreating their user account
• Ensured no other processes are using/locking the files that are being overwriten

We are using Cerberus Professional FTP server software. Any ideas of what else we could try?