Troubleshooting EC2- Linux Server Configuration

May 31, 20180 likes39 views

The user is unable to access their EC2 Linux server from a Windows machine using Putty. The server has a public IP address assigned but connection is not possible. The issue was likely an inactive internet gateway not attached to the VPC. Creating and attaching an internet gateway resolved the problem, allowing Putty connection to the server using the public IP for authentication with the ec2-user username.

Troubleshooting: EC2-Linux Server configuration
Problem Statement:
User is not able to access EC2-Linux server from windows environment using putty with its Public IP
address. Refer below shown picture:
Description of EC2- Linux server:
Instance is in running status and it has assigned public and private IP address.
Recommended solution: 1
Please check the Internet gateway. Make sure at least default IG is up and running.
 Navigate to VPC Dashboard
 Click Internet Gateway

There is no active internet gateway:
Steps to create IG; if it is not active
Click Create Internet Gateway button.
Once the gateway has been created; it will be in detached state.

Click “Attach to VPC” button on top:
Once it is done, it will be in attached state.
Once Internet gateway is up and running.
Try to access it using putty from Windows machine.
Hostname or IP address should be the IPv4 Public IP from EC2 description tab.

Browse and load Private Key file for authentication file.
Default username to login: ec2-user
Once successfully logged in using the Public IP, it will show its related private IP address as its hostname.

But we can’t login using the Private IP from external network.
Authored by: Archana Devi
Edited by: Shenbaga Sundar

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Troubleshooting EC2- Linux Server Configuration

1. Troubleshooting: EC2-Linux Server configuration Problem Statement: User is not able to access EC2-Linux server from windows environment using putty with its Public IP address. Refer below shown picture: Description of EC2- Linux server: Instance is in running status and it has assigned public and private IP address. Recommended solution: 1 Please check the Internet gateway. Make sure at least default IG is up and running.  Navigate to VPC Dashboard  Click Internet Gateway

2. There is no active internet gateway: Steps to create IG; if it is not active Click Create Internet Gateway button. Once the gateway has been created; it will be in detached state.

3. Click “Attach to VPC” button on top: Once it is done, it will be in attached state. Once Internet gateway is up and running. Try to access it using putty from Windows machine. Hostname or IP address should be the IPv4 Public IP from EC2 description tab.

4. Browse and load Private Key file for authentication file. Default username to login: ec2-user Once successfully logged in using the Public IP, it will show its related private IP address as its hostname.

5. But we can’t login using the Private IP from external network. Authored by: Archana Devi Edited by: Shenbaga Sundar