I’ve been using Duplicati for quite a while but need to switch from the file-based backups I was doing either to FTP- or SSH-based because my employer insists on disabling SMB. I’ve tried each and am having trouble with both. My server is running ProFTPD Server 1.3.6.
When I configure for FTP (and I’ve tested that my server is running FTP successfully by using the Windows/DOS FTP client to login), I get “Connection Failed: The remote server returned an error: (500) Syntax error, command unrecognized.”
When I configure for SSH using the internal library (and, again, I’ve tested that the server is running SSH successfully by connecting to is using Bitvise and Putty), I get, “Connection Failed: Algorithm negotiation failed.”
When I configure for SSH using the internal library, I get, “Duplicati was unable to verify the existence of the sftp program. sftp may work regardless, if it is located in the system search path. Do you want to continue anyway?” I’ve verified that sftp.exe is on my path and that I can connect to my server using that program.
If I click “Yes” to continue anyway, I get, "Connection failed: The host is not authenticated, please connect to the host using SSH, and then re-run Duplicati, log: E: the server’s host key is not cached. You have no guarantee E: that the server is the computer that you think it is . . . " I’ve also verified successful connectivity using ssh.exe.
Can anyone help?