Go to the EC2 console and select the instance.How to tell if you can’t ping your AWS EC2 instance because of the security group You must go to the AWS security group and open up ICMP inbound to the EC2 instance’s security group. 1: ICMP Isn’t Open Inbound in the Security Group The big things to look for when troubleshooting why you can’t ping your EC2 instance are Security Groups, Firewalls, and NACLs not letting ICMP through. Ping does not use any port, ping actually uses a separate layer 3 protocol called ICMP, layer 3 being the same layer used by UDP and TCP. You must go into the OS firewall and ensure ICMP traffic isn’t being blocked or is enabled.Ħ.1 Think of any other reasons why you might not be able to ping an EC2 instance?īefore we get into the issue it’s important to understand what ping is. This step will be different for Windows and different flavors of Linux. How to verify the OS firewall isn’t blocking Ping.You must validate your NACL isn’t blocking ICMP How to validate the NACL isn’t blocking ICMP.Read on for detailed steps on how to validate your routing setup How to validate VPC routing isn’t messed up, preventing ICMP (ping) traffic. Navigate to the EC2 console and verify your instance has a public IP
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