Instance reachability check failed & Attached EBS reachability check failed for Linux migrated with Application Migration Service

Troubleshooting EC2 Instance Connectivity and Reachability Issues

When encountering connectivity or reachability issues with an EC2 instance, the following steps can help diagnose and resolve the problem:

1. Utilize EC2 Serial Console and System Logs

• Serial Console Logs: Access the serial console logs to gather information about the instance's boot process and any issues that may have occurred.
• Console Screen: Review the console screen output for additional insights.
• System Log: Examine the system log to identify any specific errors or issues affecting the instance's connectivity.

2. Attach and Inspect the Root Volume

• Detach the Root Volume: Detach the root volume from the problematic instance if further inspection is required.
• Attach to a Different Instance: Attach the root volume to another instance with a compatible instance type.
• Inspect Logs: Mount the volume and review critical logs such as /var/log/messages, dmesg, and boot.log to find potential root causes.

3. Refer to AWS Documentation

• AWS provides extensive coverage of common EC2 instance connectivity and reachability issues in their official documentation. You can find detailed troubleshooting steps in the following guide: EC2 Instance Troubleshooting Guide.