I have 2 EC2 machines on AWS, I'm having trouble making them communicate. How could I troubleshoot it?
There are several possible causes for EC2 machines not communicating on AWS. I would suggest the following steps to get you started on fixing the issue:

1. Check the security group rules and network ACLs for your instances.
2. Verify that your instances have public IP addresses or Elastic IP addresses if you are connecting over the internet.
3. Ensure that your instances have the correct route tables, internet gateways, and NAT devices configured.
4. Test the network connectivity using ping, traceroute, or telnet commands.
How do I check the security group rules?