I'm trying to connect to a Screen Sharing service using Remmina in Debian, but it doesn't seem to connect.

But now I'm not sure now if this is possible? @DavidAnderson says:

"What make you think Screen Sharing is compatible with VNC?"

The firewall is currently disabled. The port is definitely open. And Screen Sharing was enabled remotely using this command.

sudo  /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -activate -configure -access -on -clientopts -setvnclegacy -vnclegacy yes -clientopts -setvncpw -vncpw mypasswd -restart -agent -privs -all

Is it possible to connect to an Apple Screen Sharing service using Debian or Ubuntu? If yes, how?

sh-3.2# system_profiler SPSoftwareDataType 

    System Software Overview:

      System Version: macOS 10.13.4 (17E199)
      Kernel Version: Darwin 17.5.0
      Boot Volume: lily
      Boot Mode: Normal
      Computer Name: lily’s MacBook Air
      User Name: System Administrator (root)
      Secure Virtual Memory: Enabled
      System Integrity Protection: Enabled

Yes, it is possible to connect to an OS X host using VNC.

It seems, however, that your method of turning it on from the command line doesn't work.

Instead, try

sudo defaults write \
/var/db/launchd.db/com.apple.launchd/overrides.plist \
com.apple.screensharing -dict Disabled -bool false
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.screensharing.plist

To test it I'd install telnet one the host Mac (you can do it with homebrew - brew install telnet and then try telnet localist 5900 which should get a connection. Then try the same from your Debian box. Once you know you can get a connection from the Debian box try your VNC client.

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