EC2 Website Not Accessible

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### 1. **Check EC2 Instance Status**
– Log in to your AWS Management Console.
– Navigate to **EC2 Dashboard > Instances**.
– Ensure your instance is in a **Running** state.
– Verify the instance's **Status Checks** (both "Instance reachability" and "System reachability" should pass).

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### 2. **Verify Instance Public IP**
– Confirm the **Public IPv4 address** or **Public DNS** of your EC2 instance.
– If you're using an Elastic IP, ensure it's associated with your instance.

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### 3. **Security Group Rules**
– Go to the **Security Groups** associated with your instance.
– Verify **Inbound Rules**:
– HTTP (Port 80) and/or HTTPS (Port 443) are open to **0.0.0.0/0** (or the required range).
– For SSH (Port 22), ensure it's restricted to your IP (e.g., your home or office IP).
– Verify **Outbound Rules**:
– Ensure **All traffic** or **HTTP/HTTPS** is allowed.

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### 4. **Check Web Server Configuration**
– Ensure your web server (e.g., Apache, Nginx) is running:

# For Apache
     sudo systemctl status apache2

     # For Nginx
     sudo systemctl status nginx

– Restart the service if needed:

sudo systemctl restart apache2   # For Apache
     sudo systemctl restart nginx     # For Nginx

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### 5. **Firewall Configuration**
– If using a firewall (e.g., `ufw`), allow HTTP/HTTPS:

sudo ufw allow 'Nginx Full'   # For Nginx
     sudo ufw allow 'Apache Full'  # For Apache
     sudo ufw reload

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### 6. **Application Logs**
– Check application or server logs for errors:

# For Apache
     tail -f /var/log/apache2/error.log

     # For Nginx
     tail -f /var/log/nginx/error.log

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### 7. **Route 53 (If Applicable)**
– If you use a custom domain, verify your DNS records in Route 53 or your domain provider.
– Ensure the **A Record** points to the public IP of your EC2 instance.

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### 8. **Check Instance Billing**
– Ensure your free-tier usage hasn't exceeded limits. If it has, your instance may have been throttled or stopped. Check the **Billing Dashboard** for usage and charges.

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### 9. **Instance Metadata and Services**
– If using Docker or other services, ensure they are running:

docker ps      # List running containers
     docker logs <container-id>  # Check logs of a specific container

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### 10. **Test Access**
– Test access using:
– Public IP: `http://`
– Public DNS: `http://`
– If it works internally (e.g., `curl localhost`), but not externally, it's likely a networking issue.

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### Common Resolutions:
– **Security Group Missing Rule:** Add rules for HTTP/HTTPS.
– **Server Not Running:** Restart your web server.
– **Blocked by Firewall:** Update firewall rules.
– **DNS Issue:** Correct DNS settings to point to your EC2 instance.

If you still face issues, share any specific error messages or details, and I’ll help further.

### 1. **Check Instance System Logs**
– **Reboot the instance** from the EC2 console to see if it resolves the issue.
– After rebooting, check the **System Logs**:
– Go to **EC2 Dashboard > Instances**.
– Right-click the instance and select **Instance Settings > Get System Log**.
– Look for any error messages that might indicate issues during boot (e.g., file system errors, missing dependencies, or crash messages).

### 2. **Review EC2 Console Output for Boot Errors**
– You can also view the **EC2 Console Output** to check for boot-related issues.
– In the EC2 console, go to your instance's details and find the **Actions > Monitor and Troubleshoot > Get System Log** to view the last output during boot.

### 3. **Check for Disk Space or Filesystem Issues**
– If there’s an issue with disk space or filesystem corruption, the instance may fail to boot properly. You can troubleshoot this by:
– Stopping the EC2 instance.
– Detaching the **EBS volume** from the instance and attaching it to another EC2 instance as a secondary volume.
– Inspect the logs and files on the attached volume.
– If necessary, you can perform filesystem checks or free up space.
– After fixing issues, reattach the volume and start the instance.

### 4. **Check Network Configuration**
– Verify that your instance's **network interfaces** are configured correctly:
– Ensure the instance is in a **VPC** and **subnet** with proper route tables and internet access (e.g., NAT gateway, public IP, or Elastic IP if required).
– Ensure **Security Groups** and **Network ACLs** allow inbound traffic on the necessary ports (HTTP, SSH, etc.).

### 5. **Check Instance Health Metrics**
– If it's a **hardware failure**, the EC2 instance might have an underlying issue that AWS cannot fix automatically.
– In the EC2 Console, go to the **Status Checks** tab to see if AWS reports any hardware issues. If AWS detects a hardware issue, they might automatically offer to **stop and restart** the instance or provide an option to **replace** it.

### 6. **Reboot or Launch New Instance**
– If the instance is still not reachable after these steps, try:
– **Rebooting** the instance.
– If the instance remains in a failed state, you can **stop and start** it (not terminate).
– If the issue persists after restarting, you may need to **create a new instance** and migrate your data from backups or another volume.

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### Steps for Instance Recovery (if needed):
1. **Stop the instance** (do not terminate).
2. **Detach the root volume** and attach it to another running instance.
3. **Mount the volume** on the second instance and check logs for errors.
4. After resolving issues, **reattach the volume** to the original instance and **start it**.

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If the issue is critical and you're unable to resolve it, consider **contacting AWS Support** for more direct assistance.

Let me know if you need more detailed steps for any of these actions!