Use the Amazon EC2 serial console to diagnose and troubleshoot possible issues with your Amazon EC2 Linux and Windows instances.

Learn how Amazon EC2 provides your instances with public and private IP addresses and DNS hostnames.

To verify the fingerprint of your key pair, compare the fingerprint displayed on the Key pairs page in the Amazon EC2 console, or returned by the describe-key-pairs command, with the fingerprint that you generate using the private key on your local computer. These fingerprints should match.

You can assign a security group to an instance when you launch the instance. When you add or remove rules, those changes are automatically applied to all instances to which you've assigned the security group. For more information, see .

Use Amazon EC2 to reboot your instance for necessary maintenance.

Recover your Amazon EC2 instance automatically by using the default configuration. If an instance becomes impaired because of an underlying hardware failure, the instance is automatically recovered.

Change the instance type of your Amazon EC2 instance to an instance type that is appropriate for its workload or to use features that are available on other instance types.

Stop and start any instance with an Amazon EBS volume as its root device.

Amazon EC2 provides different purchasing options that enable you to optimize your costs.

Use a key pair to connect to your Amazon EC2 instance.