Cyberduck Mountain Duck CLI

Version 96 (modified by svogt, on Apr 21, 2021 at 6:20:26 AM) (diff)


Cyberduck Help / Howto / Opening Connections

Supported protocols

All major server and cloud storage protocols are supported to connect to just about any server you want.

Toolbar button

Click the New Connection toolbar button or File → Open Connection... (macOS ⌘O Windows Strg+O). If you want to open a connection in a new browser window, choose File → New Browser (macOS ⌘N Windows Strg+N) first.

Quick Connect

Type in the name of the server directly into the Quick Connect field in the toolbar. The text field will autocomplete from bookmarked hosts. You can enter a string in the format user@host, i.e., or a fully qualified URL such as Refer to valid URI formats for input.

If you enter just the hostname, the default protocol as configured in Preferences → General → Connection will be used.


Select Bookmarks → Toggle Bookmarks (macOS ⌘B Windows Strg+B) and double click a bookmark to connect. If you want to bookmark a connection already open, choose Bookmark → New Bookmark (macOS ⌘⇧B Windows Strg+Shift+B) and it will add a new bookmark with the current connection settings.

Additionally, you can switch to the History or Bonjour in the bookmark view.


List all recently connected servers. Select a bookmark from the menu Bookmark → History or the History tab of the bookmark view.


Auto-discovery of SFTP, FTP & WebDAV services in your local network. Discovered services appear in the Bookmark → Bonjour application menu and the Bonjour tab of the bookmark view.

Opening connections from

Bookmark File

Double click a Cyberduck .duck bookmark file in the Finder.

Internet Location File

Double click an Internet Location File in the Cyberduck must be configured as the default protocol handler for the given protocol of the URL.

Use Spotlight

Application launchers


Quicksilver is a launcher application. Open the Quicksilver Preferences and install the Cyberduck Module. Then when Cyberduck is selected in Quicksilver use the right-arrow key to access bookmarks within Quicksilver.


Indexing rule for Cyberduck.

From thirdparty application

Drag an URL from any third-party application to a browser window.

  • Drag an URL (e.g. from Safari) to the browser list or outline view to open a new connection.
  • Drag an URL to the bookmarks to create a new bookmark.

Problems Connecting

I get an error IO Error: Broken pipe

There was a problem with the underlying network stream either because the connection was too slow or the server wouldn't give a response anymore. Often this is caused when you run out of quota on the server - meaning that your user account is not allowed to use any more disk space.

I get an error IO Error: Read Timed Out

When attempting to open a connection, there is either a firewall blocking requests, or no server is listening at the given address and port. If you get this error while already connected to the server, the network connection to the server is too slow or has too high latency. You can try to increase the connection timeout in Preferences → Connection → Timeouts.


Manage your passwords with Keychain on Mac. Refer to Keychain for Mac: Keychain Access overview.

Passwords are saved in the Credential Manager. You can view and delete your saved login information in Control Panel → User Accounts → Credential Manager → Windows Credentials.


Refer to Provide log output.

Proxy Configuration

The following proxies are supported:

  • SOCKS Proxy for all connections.
  • HTTP proxy tunneling using CONNECT for all connections.


The following proxy settings in System Preferences → Network are supported:

  • The option Exclude simple hostnames is respected and applies to all hostnames not fully qualified.
  • The hostnames and wildcards in Bypass proxy settings are applied.
  • CIDR notations are parsed and matched against the IPv4 address of the hostname.

The Automatic Proxy Configuration using a Proxy Configuration File is currently ignored.

Enable HTTP Connect proxy for SFTP and FTP connections

Choose FTP Proxy and select the checkbox to configure the proxy address. Example HTTP Connect Proxy Configuration for FTP and SFTP.png


All proxy settings in Internet Explorer Tools → Internet Options → Connections tab → LAN Settings button are supported. Refer to Change proxy server settings in Internet Explorer.

Integrated Windows Authentication (IWA)

Integrated Windows Authentication (IWA) for proxy authentication of HTTP connections is supported.


Connection → Timeouts

You might need to adjust the timeout to wait for an answer from the server. The default is set to 30 seconds.

Connection → Repeat failed networking tasks

Failed transfers due to network connection issues such as a low latency can be chosen to be repeated with a configurable number of retries.

Connection → Proxies

Choose Cyberduck → Preferences → Connection → Use system proxy settings. No additional configuration needed.

General → Connection → Use Keychain

Search for and save passwords for connections.

Prefer IPv6 adresses of DNS lookups

A hidden configuration option. Refer to #2539.

defaults write ch.sudo.cyberduck connection.dns.ipv6 true

Disable Bonjour support

A hidden configuration option.

defaults write ch.sudo.cyberduck rendezvous.enable false

Disable Bonjour notifications in Notification Center and System Tray

A hidden configuration option. By default, the limit is set to allow not more than 30 notifications per minute.

defaults write ch.sudo.cyberduck rendezvous.notification.limit 0

Default protocol handler

You can set Cyberduck or a third-party application as the default application (protocol handler) for FTP and SFTP in Preferences → FTP and Preferences → SFTP respectively.

Web Browser

When you click URLs in another application like your web browser, this application is opened to open the URL instead.


macOS only This also works when working in Type open sftp://host to open with Cyberduck registered as the default protocol handler for SFTP.


Double click the connection profile file (.cyberduckprofile) to open and register the profile. When using the CLI refer to the documentation.

File Format

Refer to the technical documentation.

Attachments (7)

Download all attachments as: .zip