Yesterday, I have setup the Oracle Free Tier computing cloud, created a VM instance and assigned a public ip and opened ports. Immediately thereafter, I could login via ssh into the VM and connect via internet to the server I run in the VM. But within the hour, I can’t connect anymore via ssh or to the server, although in https://cloud.oracle.com the instance is said to be running. When I reboot the vm instance, it works again for a while, but not for long.
Is there a way to keep it working?