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Amazon Elastic Compute Cloud Developer Guide Error Messages An instance's state is changed to running as soon as we start to boot your OS. This means there will be some delay (possibly a few minutes depending on your configuration) during which your instance will not have been fully set-up. After this period, it should be fully functional. Additionally, you will need to make sure you have authorized the appropriate access to your host through the Amazon EC2 firewall. If you have launched your instances without specifying a security group, the default group is used. Permissions on the default group are very strict by default and disallow all access from the Internet and other groups. You will need to add permissions to your default group or you will have to set up a new group with appropriate permissions.For more information, see "Securing the Network” in the Developer Guide. Assuming you have authorized port 22, a useful debugging tool is to try to open an ssh connection with verbose output. You should use the man page to get the exact syntax for your system, but the command is likely to look like ssh -vv root@[hostname]. This output would be very useful if posting to the forum. Why did my instance terminate immediately after launch? Launch errors may be the result of an internal error during launch or a corrupt Amazon EC2 image. The former should be rare, and we actively test for and isolate suspect hosts. You should use the “DescribeInstances” API to look for more details on why your instance failed to launch. NB: the ec2-describe-instances command line tool does not conveniently print out this information yet! You can use the -v flag to read the SOAP response from this tool and get the information discussed above. You can always feel free to attempt to launch the image again, but if you run into a persistent problem (especially with a shared image), you should post to the Amazon EC2 forum. I ran shutdown from within an ssh session but my instance still shows up as running when I query it with DescribeInstances and I can't shell into it. What's happening? This is a "feature" of the shutdown command. If you issue shutdown without a -h (halt) flag it shuts down the network and switches to single user mode. The instance is still running but without a network. You should always use shutdown -h when working inside an Amazon EC2 instance. You can shut the instance down using the TerminateInstances call (ec2-terminate on the command line). Why are my instances stuck in a pending state (or a shutting-down state)? This situation should be rare and is the result of a software error or misconfiguration. We actively monitor for it, but please let us know if you do encounter this. Why do I get an "AuthFailure: User is not AMI creator" error when I try to register an image? Make sure that you are using the correct user ID and certificate to create and upload the image. You need to use the same ID and certificate to register the image with Amazon EC2. Error Messages Why do I get an "InsufficientInstanceCapacity" error when I try to launch an instance? This error indicates that we do not currently have enough available capacity to service your request. During our beta, capacity is limited. If you are requesting a large number of instances, there may not be enough server capacity to host them. You could try again at a different time or specify a smaller number of instances to launch. API Version 2007-03-01 153