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You may find it helpful to keep in-mind that an EC2 instance with a Public IP address, relies on the Internet Gateway to perform the (inbound) NAT. I'd try to find a solution that doesn't use an inbound rule of ANY Source IP but if you really need to deploy this architecture, here is a reference deployment: Linux Bastion Hosts on AWS - Remote access in the AWS Cloud
Hello,
To troubleshoot the issue, try the following steps:
Check the security group: Ensure that the inbound rule for the VNC port (default is 5901) allows traffic from your IP address.
Verify the VNC server configuration: Make sure the VNC server is configured to accept connections from external IP addresses.
Check the instance's network settings: Ensure that the instance's network settings allow outbound traffic on the VNC port.
Try a different VNC viewer: Try using a different VNC viewer, such as TightVNC or RealVNC, to rule out any issues with Ultra VNC Viewer.
Check the instance's system logs: Check the instance's system logs for any error messages related to the VNC server or connections.
Restart the VNC server: Try restarting the VNC server to see if it resolves the issue.
Probably a daft question, but is your EC2 instance running in graphics mode? What I mean is, you've installed GNOME or XFCE or similar, and enabled it, and the Linux default run-level is set to graphical.target ?
Thanks for the help. I have installed GNOME, but I haven't touched any settings. could you please guide me which files to check?
sudo systemctl get-defaultwill display the current default run level. If this isn't graphical.target then set it to that withsudo systemctl set-default graphical.targetI would advise taking a backup or snapshot of the system before you start, just in case this leaves your system unbootable or unreachable.
Thanks for your help. Can you tell me more about 'VNC server configuration'? perhaps I should modify '.vnc/xstartup' or '.vnc/config'?