Known Issues

Performance Considerations

To reduce the number of requests to the remote server for mounted volumes, we recommend the following settings when running in Online connect mode.

  • Choose View → Hide Preview (⌘⇧P)

  • Disable View → Show View Options → Show icon preview

Characters to Avoid

The following characters should be avoided within file and folder names.

  • : (colon)

  • / (forward slash)

  • \ (backslash)

Known Issues

Can Only Open Single PDF in Adobe Acrobat Reader

This is a known bug in Adobe Acrobat Reader when opening documents from a network volume. As a workaround uncheck edit → Preferences… → Security (Enhanced) → Enable Protected Mode at startup.

rsync Fails with Error

If your server does not accept the creation of . temporary files you might need to add the --inplace when running rsync.

High CPU Usage when Working with Sublime Text

  • When working with Sublime Text we recommend turning off indexing by adding the following setting to your user preferences in Sublime Text.
    "index_files": false

  • You might want to turn off Git support in Sublime which has caused high CPU usage for some users when scanning .git folders.
    "show_git_status": false

Sharing a Mounted Drive in Local Network

It is not possible to share a mounted drive within the local network.

Changes from Server not Immediately Visible

The directory listing in or File Explorer may become out of date when another application is adding , removing, or modifying files on the server. You can force File Explorer to refresh the directory listing with F5. On macOS, choose Reload from the Finder Extension menu. Enable Sync → Index files in Preferences to look for remote file changes every 10 minutes.

Cache Uses a lot of Disk Space

The cache directory is located in %LocalAppData%\Cyberduck\Cache on Windows or within Application Support folder on macOS by default. You can change the cache location to any writable location. You can clear cached files from the local disk with the Delete on local disk context menu option.

Send Command

Missing Sync Status Icons

When you have other applications installed that register a Finder Extension (macOS) for the volume mounted, the status icon may not appear. This has been reported for the following applications:

Please check in System Preferences → Extension → Finder for other applications that may override the badge icons.


If none of those applications are in use, a Finder re-launch can make the badge icons appear again.

Operating System Specific Issues

Mount is not Visible within the Media Browser (Adobe Premiere)
Bookmarks mounted by Mountain Duck aren’t visible within the Media Browser of Adobe Premiere. The mount location needs to be changed (e.g. to the desktop) to make the mount visible. Does not Show Files Prefixed with . on Remote Volumes
You can work around this by setting defaults write AppleShowAllFiles YES in a window and restart using → Force Quit … → Finder → Relaunch. If you are running macOS Sierra (10.12) you can choose ⌘⇧. to toggle files starting with a dot to show in

Original Document can’t be Changed (
Files opened in and edited cannot be saved at the original location but the message “The original document can’t be changed, so a duplicate with your changes has been created” is displayed in the title bar. As a workaround, you can set a custom mount point in Preferences → Connection → Mount Location for volumes such as a ~/Volumes/ folder in your home directory.

Enable Application Icon in Dock
As a utility application with no application windows, no icon is displayed in the Dock but only in the system status bar. If you want to enable the application icon to appear in the Dock set the following property

defaults write io.mountainduck application.dock.icon.enable true

Mounted Volumes do not Appear on the Desktop
Navigate to volumes using ⌘⇧C in a window or choose Finder → Preferences … → General → Show these items on the desktop: Connected Servers to make the volume appear on the desktop. Mounted volumes are also listed in the sidebar in Favorites.

Search in (Spotlight)
The Spotlight indexer does not work on remote volumes

Multiple Mountain Duck Finder Extensions Processes
The system may launch additional copies of Mountain Duck Finder Extension whenever an Open or Save dialog is displayed. This means there may be multiple copies of the extension running at once, and some may be very short-lived.

Connection Interrupted
It may be that Finder closes the connection because Mountain Duck hasn’t answered fast enough on the request of Finder. Although Finder indicates that the server connection is interrupted it isn’t as Mountain Duck is still connected to the server.

This is an issue within the operating system that can occur to any network drive.

Additional ._* Files Saved on Remote Volumes
The ._* files contain metadata about the files some applications write in additional to the file content. On macOS, this metadata can be stored alongside the file on the filesystem, but on remote volumes, with no metadata suppport, an auxiliary file is created to contain this information. You can delete metadata on files using xattr -d <filename>.

As of version 2.1, extended attributes are only saved in a temporary location and not stored on the mounted remote volume. If you want to revert to saving extended attributes to the server, enter in a window

defaults write io.mounteinduck fs.filesnames.metadata.enable false

If you want to delete metadata files, you can open a window and enter dot_clean -m <folder>.


Hosting Service Providers

A list of known providers that fail to work with Mountain Duck due to interoperability issues.

  • OwnCube: Their deployment does not work and we discourage this product.

  • Bitnami ownCloud: PHP-FPM is enabled by default in virtual machines and Ubuntu-based cloud images but must be disabled for uploads to complete. Refer to How to disable PHP-FPM and 0 byte files on WebDAV server.

Third-Party Software

Kaspersky Internet Security

Make sure to uninstall Kaspersky Internet Security with its kernel extensions causing kernel panics prior to mounting a volume.

Eset Cyber Security Pro

Make sure not connections on the loopback interface are blocked.


Be aware that Bitdefender may interfere with connections.

Sophos Endpoint Protection

May interfere with installation.


Time Machine
Backups to Time Machine do not work with volumes mounted from Mountain Duck. Time Machine requires disks mounted using Apple File Protocol (AFP). See Backup disks you can use with Time Machine.

Bug Reports and Feature Requests

To get help with bugs, feature requests, or other issues please refer to the support page.