If the notification vanishes before the user can accept it, it can usually be found logged in the notification center.

Solution: Ensure that a user is at the remote host and that they're able to find the notification for the connection request. Problem: The remote host is configured to permit screen sharing but requires a user to let you in, and there's no user currently at the computer, or the user isn't accepting your connection request. Solution: Enable screen sharing in the Sharing section of GNOME Settings. Problem: The remote host isn't configured to permit screen sharing. Here's a checklist in the order you should diagnose each problem: Screen sharing When a VNC connection fails, there are a few likely reasons. In the Screen Sharing window that appears, choose whether you want to require the user to accept a connection request by clicking an onscreen button or whether you prefer to create a password for entry. In GNOME Settings, click Sharing in the list in the left column. If you've never had access to the remote computer, you'll have to talk the user through these steps or send them my article Share screens on Linux with GNOME Connections. To allow screen sharing, open the Settings application from the Activities menu of the computer's GNOME desktop. You must enable screen sharing on the remote machine before it even considers a VNC connection request. The GNOME desktop provides the Connections application to help you connect to remote machines from your local host. It must have an application to make and manage the VNC request. The local host is the computer you're using when you want to reach out and connect to a remote screen. These configurations include screen-sharing permissions, internal firewall rules, and possibly external firewall rules and port forwarding. The remote host is the computer you're connecting to. You must configure it to allow connection requests. There are two components to connecting over VNC, and you can use one or both components. There's not much to it, so this article demonstrates how to configure your system for screen sharing and troubleshoot when things go wrong. This also means that Linux users and admins need to learn about new configuration options so that their computers can connect with one another. Now that VNC is the primary means of remote graphical login for Linux, new VNC applications are being written to integrate it with the rest of the desktop.

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