This error message typically means that the VNC server has disconnected from the VNC viewer due to a lost connection. This could be caused by various issues such as network connectivity problems, firewall issues, or the VNC server simply crashing or shutting down. To resolve the issue, try the following:
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Check your network connection and make sure you have a stable connection to the VNC server.
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Verify that your firewall settings are not blocking the VNC traffic.
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Verify that the VNC server is still running and accessible. If not, restart it and try again.
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If the issue persists, try connecting from another device or use a different VNC viewer program.