A virtual machine encounters a network connection failure issue, solution one.
1.Check the network management service
systemctl list-units | grep network
If the following result appears, it indicates that network.service is in a failed state.

2.Restart network.service
sudo systemctl restart network.service
3. Check again
systemctl list-units | grep network
If the following result appears, it indicates that network.service is in an active state.

nmcli device status # Check the status of network devices
The following status indicates normal operation

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