Amazon EC2 instance problem: not accessible from the network
I had my first issue with Amazon EC2 this week. I rebooted a Windows Server EC2 micro instance and when it came back up, it was no longer accessible via RDP. I tried stopping it and starting it several times with no success. I found these instructions to fix the problem.
3. Right click the instance in the management console, select change instance type such as C3.*, R3.*, or I2.* (This upgrades the instance to a different network platform. The public IP address will probably also change.)