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Vnc server management

vnc server management

The default in SUSE Linux Enterprise Server is vncviewer, provided by the tigervnc Check Allow Remote Administration Without Session Management. Install the VNC Server software and assign a VNC password on the client computer. click Sharing, then select Remote Management in the list at the left. Secure, cost-effective remote access and support for your computer, from your desktop or mobile device. VNC® Connect enables cloud or direct connectivity. TIGHTVNC SERVER RASPBERRY Вы можете прийти к нам.

Access to persistent sessions is protected by two possible types of passwords:. Open a shell and make sure you are logged in as the user that should own the VNC session. If the network interface serving the VNC sessions is protected by a firewall, you need to manually open the port used by your session in the firewall.

If starting multiple sessions you may alternatively open a range of ports. See Chapter 15, Masquerading and Firewalls for details on how to configure the firewall. For persistent sessions, the VNC display and the X display usually have the same number. To start a session with a resolution of x pixel and with a color depth of bit, enter the following command:. The vncserver command picks an unused display number when none is given and prints its choice. See man 1 vncserver for more options.

When running vncserver for the first time, it asks for a password for full access to the session. If needed, you can also provide a password for view-only access to the session. The password s you are providing here are also used for future sessions started by the same user. They can be changed with the vncpasswd command. Make sure to use strong passwords of significant length eight or more characters. Do not share these passwords.

To terminate the session shut down the desktop environment that runs inside the VNC session from the VNC viewer as you would shut it down if it was a regular local X session. If you prefer to manually terminate a session, open a shell on the VNC server and make sure you are logged in as the user that owns the VNC session you want to terminate. Run the following command to terminate the session that runs on display :1 : vncserver -kill Persistent VNC sessions are configured in a single per-user configuration.

Multiple sessions started by the same user will all use the same start-up and password files. After you enable the VNC session management as described in Procedure 8. You will be presented with the login screen. After you log in, the 'VNC' icon will appear in the system tray of your desktop environment. Click the icon to open the VNC Session window. If it does not appear or if your desktop environment does not support icons in the system tray, run vncmanager-controller manually.

This is equivalent to a one-time session. It is not visible to others and will be terminated after you disconnect from it. The session is visible to other users and keeps running even after you disconnect from it. Here you can specify the name of the persistent session so that it is easily identified when reconnecting. The session will be freely accessible without having to log in under user credentials.

You need to log in with a valid user name and password to access the session. List the valid user names in the Allowed users text box. Allows multiple users to join the persistent session at the same time. Good for remote presentations or trainings. After you set up a persistent VNC session as described in Section 8. After your VNC client connects to the server, you will be prompted to choose whether you want to create a new session or join the existing one:.

After you click the name of the existing session, you may be asked for login credentials, depending on the persistent session settings. The authentication happens at the beginning of the session; the actual data transfer only begins afterward. The -securitytypes parameter selects both authentication method and encryption. It has the following options:. Anonymous TLS encryption.

Everything is encrypted, but there is no verification of the remote host. So you are protected against passive attackers, but not against man-in-the-middle attackers. TLS encryption with certificate. If you use a self-signed certificate, you will be asked to verify it on the first connection. On subsequent connections you will be warned only if the certificate changed.

So you are protected against everything except man-in-the-middle on the first connection similar to typical SSH usage. If you use a certificate signed by a certificate authority matching the machine name, then you get full security similar to typical HTTPS usage. With X based encryption, you need to specify the path to the X certificate and the key with -XCert and -XKey options.

If you select multiple security types separated by comma, the first one supported and allowed by both client and server will be used. That way you can configure opportunistic encryption on the server. This is useful if you need to support VNC clients that do not support encryption. On the client, you can also specify the allowed security types to prevent a downgrade attack if you are connecting to a server which you know has encryption enabled although our vncviewer will warn you with the "Connection not encrypted!

Contents Contents. Note: Session Types A machine can offer both kinds of sessions simultaneously on different ports, but an open session cannot be converted from one type to the other. Note: Display and Port Number The actual display or port number you specify in the VNC client must be the same as the display or port number picked by the vncserver command on the target machine. Figure 8. Name Name of the profile. It will be listed in the main window.

Protocol The protocol to use when connecting to the remote session, for example VNC. User name, Password Credentials to use for remote authentication. Leave empty for no authentication. Color depth, Quality Select the best options according to your connection speed and quality. Tip: Disable Encryption If the communication between the client and the remote server is not encrypted, activate Disable encryption , otherwise the connection fails.

Procedure 8. Confirm your settings with Next. To start a session with a resolution of x pixel and with a color depth of bit, enter the following command: vncserver -alwaysshared -geometry x -depth Important: Security Considerations Make sure to use strong passwords of significant length eight or more characters. Non-persistent, private This is equivalent to a one-time session.

Persistent, visible The session is visible to other users and keeps running even after you disconnect from it. Session name Here you can specify the name of the persistent session so that it is easily identified when reconnecting. No password required The session will be freely accessible without having to log in under user credentials. Alternatively depending on the implementation a browser can connect to the server default port: And a server can connect to a viewer in "listening mode" on port One advantage of listening mode is that the server site does not have to configure its firewall to allow access on port or ; the duty is on the viewer, which is useful if the server site has no computer expertise and the viewer user is more knowledgeable.

The server sends small rectangles of the framebuffer to the client. In its simplest form, the VNC protocol can use a lot of bandwidth , so various methods have been devised to reduce the communication overhead. For example, there are various encodings methods to determine the most efficient way to transfer these rectangles.

The VNC protocol allows the client and server to negotiate which encoding they will use. The simplest encoding, supported by all clients and servers, is raw encoding , which sends pixel data in left-to-right scanline order, and after the original full screen has been transmitted, transfers only rectangles that change. This encoding works very well if only a small portion of the screen changes from one frame to the next as when a mouse pointer moves across a desktop, or when text is written at the cursor , but bandwidth demands get very high if a lot of pixels change at the same time such as when scrolling a window or viewing full-screen video.

Different port assignments can be used as long as both client and server are configured accordingly. Although possible even on low bandwidth, using VNC over the Internet is facilitated if the user has a broadband connection at both ends. However, it may require advanced network address translation NAT , firewall and router configuration such as port forwarding in order for the connection to go through. To applications, Xvnc appears as an X "server" i.

Applications can display themselves on Xvnc as if it were a normal X display, but they will appear on any connected VNC viewers rather than on a physical screen. In addition, the display that is served by VNC is not necessarily the same display seen by a user on the server. It is also possible to run multiple VNC sessions from the same computer. Users commonly deploy VNC as a cross-platform remote desktop system.

By default, RFB is not a secure protocol. While passwords are not sent in plain-text as in telnet , cracking could prove successful if both the encryption key and encoded password were sniffed from a network. For this reason it is recommended that a password of at least 8 characters be used.

On the other hand, there is also an 8-character limit on some versions of VNC; if a password is sent exceeding 8 characters, the excess characters are removed and the truncated string is compared to the password. UltraVNC supports the use of an open-source encryption plugin which encrypts the entire VNC session including password authentication and data transfer.

However, use of such encryption plugins makes it incompatible with other VNC programs. To circumvent this, it should be tunneled through an SSH connection see below. There are also freeware applications that create instant VPN tunnels between computers.

An additional security concern for the use of VNC is to check whether the version used requires authorization from the remote computer owner before someone takes control of their device. This will avoid the situation where the owner of the computer accessed realizes there is someone in control of their device without previous notice. From Wikipedia, the free encyclopedia.

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