"Connection Failed
You cannot connect to the VM instance because of an unexpected error. Wait a few moments and then try again."
When I tried to copy file from one virtual machine to another using scp, ssh client loses connection. Command that I run is the following:
gcloud compute scp --recurse file_name account@instance_name:~/folder --zone zone_name --project project_name
What can be the reason of it?
Make sure that you have opened port 22, which is the port that allows communication with SSH. If you are not sure, you can create a rule by going to VPC -> Firewall Rules -> port 22.
Here is an article that can help with allowing SSH connection
This other article can help you troubleshooting SSH
You can also run the following command to check which ports you have open netstat -tuplen, make sure you have port 22 listening.