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If you are using an old legacy serial number (e.g., for VNC Server 5.x), that key will only validate versions released prior to your support contract's expiration. Trying to update to a modern version of VNC Connect with a legacy key will result in a licensing error, causing the server to stop accepting connections. vnc server license key serial number upd
to find your 25-character key (for 6.x) or long offline key (for 7.x). Applying via Command Line : If you are using an old legacy serial number (e