Topic "SFTP protocol violation: Invalid response message type (0)"

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I have a problem with making new folder, or copy folder in SFTP connection. I've clean all data, sessions, reinstall winscp but problem still occurs. I've tried filezilla and there it is no problem. Connection to server going normally, but after trying to make a new folder anywhere, or copy folder this is the error: SFTP protocol violation: "Invalid response message type (0). Error creating folder 'folder' ". Copy files and deleting or updating goes normally.

WinSCP 5.7 I'm using long time but today after make som changes in session info there is this error. As I mentioned I've tried to clean all and connect but still nothing.

I login in saved session. After that I press F7 key and try to make new directory. After that winscp show me error message.
I'm using GUI - Commander, Windows 8.1 64 bit, WinScp 5.7 last build and log file is attached. (3.77 KB) Private file

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Thanks for your report.
It looks like a bug in ProFTPD/mod_sftp server.

I have reported it:

As a workaround, force SFTP version 5:

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