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I have installed FileZilla 3.41.2 on my macOS High Sierra 10.13.6. From the terminal if I do the following, I am able to connect to server and access the files the SFTP server

sftp my_user@my_server_ip

However when I connect to the same server using fileZilla I get the below error

Status:         Connecting to my_server_ip...
Response:       fzSftp started, protocol_version=8
Command:        open "my_user@my_server_ip" 22
Error:          Server unexpectedly closed network connection
Error:          Could not connect to server

In FileZilla's settings I have also increased my timeout to 30s and retry count to 1

Please can you help me figure out why I am unable to connect to the SFTP Server using Filezilla

  • Show us verbose logs for both sftp and FileZilla. – Martin Prikryl Apr 25 '19 at 9:07
  • Does your ~/.ssh/config or /etc/ssh/ssh_config (or whatever applies in macOS) specify any non-standard options that apply to my_user@my_server_ip? The point is these files affect sftp but FileZilla has its own config, I think. – Kamil Maciorowski Apr 25 '19 at 9:09
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I had this problem on one particular site.

Logging at the "verbose" level, as suggested above by @Martin revealed that there was a newline character at the end of the username that I'd pasted into the Site Manager window when setting up the Host details.

Removing the newline (and retyping the last few characters) resolved the issue.

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It could perhaps be a problem with the default cipher used by FileZilla. If you have access to the server you might find a logged error that looks something like:

sshd[29972]: fatal: matching cipher is not supported: [cipher-name]

Unfortunately, FileZilla has no cipher option, so you cannot dictate the cipher. The FileZilla Client doesn't use the sftp command, using instead a bundled one (fzsftp). This executable is a modified version of PuTTY's psftp and cannot be configured in any way.

You may try to match the OpenSSH version on the server with a FileZilla client dating from the same period, but my knowledge about this is sketchy.

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