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robert-claypool/putty-ssh-to-amazon-linux.md

Created August 3, 2015 04:55
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Troubleshooting PuTTY SSH to an Amazon Linux instance in a VPC
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putty-ssh-to-amazon-linux.md

http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html#TroubleshootingInstancesConnectingPuTTY

  • Check the instance security group rules. Allow incoming SSH, port 22.
  • Are DNS resolution & hostnames enabled for the VPC?
  • Does the VPC have an Internet gateway?
  • Check the route table for the VPC subnet. Add 0.0.0.0/0 --> Internet gateway
  • Check the network access control list (ACL) for the subnet. Allow incoming SSH, port 22.
  • Use the right private key, duh. Look it up under the instance details, https://console.aws.amazon.com/ec2/v2/home

Login as the right user:

  • For an Amazon Linux AMI, the user name is ec2-user.
  • For a RHEL5 AMI, the user name is either root or ec2-user.
  • For an Ubuntu AMI, the user name is ubuntu.
  • For a Fedora AMI, the user name is either fedora or ec2-user.
  • For SUSE Linux, the user name is either root or ec2-user.
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