If you have previously used VNC, the new process will sometimes use your previous session password. If you have forgotten your previous session password, run the command vncpasswd to change it. Your VNC session has been created, and you should see a message similar to the sample output below.
The number that appears after the host address is the display number it is underlined in red in the image above. For example, if your display number is 4, your port number is If your display number is 12, your port number is NOTE: Your display number may not be the same as the sample image above.
Make sure to read the output message in your terminal and look for the number after the semicolon for your true display number. You can exit and close this terminal if you want, as the VNC session will continue to run in the background.
In MobaXterm, click on the Session button in the upper left hand corner. In the window that pops up, look for the VNC icon in the top row and click on it. If VNC Server is configured to accept connections only via local loopback then the Hosts option is ignored.
VNC Server can filter incoming connection attempts based upon the apparent IP addresses of their originators. Which IP addresses are allowed to connect and which are not is determined by the Hosts pattern. The pattern consists of a comma-separated list of IP address specifications, prefixed by an action. Each specification starts with an action, gives an IP address, and a subnet-style mask.
The first specification to match the address of the new connection determines the action that will performed. The pattern given above allows the computer with address All other connections are rejected by the - term, which is actually redundant in this case - a connection will always be rejected if it doesn't match anything in the Hosts pattern.
Note that IP addresses and masks are specified in Type-A xxx. The specification The Hosts pattern can be edited more easily through the Access Control interface, which allows IP address specifications to be edited individually and moved up to match first or down to match last the list. The Authentication page allows you to configure the required mode of authentication and level of security of VNC connections.
If your VNC Server is operating in a protected environment, such as a secure LAN or firewall-protected network, then you may wish to configure VNC Server to accept connections without requiring a username or password to be specified. We advise extreme caution when disabling authentication. Do not disable it unless you are absolutely sure that the host network is completely secure. VNC Password Authentication allows a single password of up to 8 characters to be stored by VNC Server, which remote users must supply when prompted in order to authenticate.
The password to use can be configured by selecting Configure and typing the new password twice. On platforms which support it, the password and all other configuration options are protected using native operating system security methods, so that the password cannot be read or tampered with by other users.
By default, VNC Server allows Viewers to connect as long as the correct username and password are supplied. QueryConnect allows an extra level of protection to be applied, requiring a local user to explicitly accept incoming connections. When QueryConnect is enabled, incoming connections are first authenticated in the normal way. If the user authenticates successfully then a dialog is presented on the server's desktop, displaying the IP address and username of the incoming connection, and requiring a local user to accept the connection.
If the user does not accept the connection within a specified timeout then it is rejected. If an incoming connection requiring acceptance by the local user is received while an earlier connection is being queried then the second connection is automatically rejected, for security reasons.
Connections from specific hosts or subnets can be configured to be queried via the Hosts configuration setting. This option affects the behaviour of the QueryConnect option, if enabled. If this option is set then the local user will only be prompted to accept the incoming connection if they are logged in. If this option is not set then the local user will always be prompted, regardless of whether or not they are logged in. Note that it is not possible to reliably detect whether or not a user is logged in on some older Windows platforms.
On these platforms, this option will err on the side of security and always prompt the local user. If QueryConnect is enabled then the Query Connection dialog will be displayed by default for ten seconds before automatically rejecting the connection. The timeout value can be modified by setting QueryConnectTimeout accordingly. If this option is unticked then incoming pointer movements from all clients will be ignored, preventing any remote VNC Viewer from affecting the pointer of the VNC Server's desktop.
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