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Based on your description, it seems that the issue is not with the Elastic IP itself, but rather with how your EC2 instance is configured to handle HTTP requests after the IP change. Here are some potential causes and solutions to consider:
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Web Server Configuration: Your web server (likely Apache for WordPress) might be configured to listen only on specific IP addresses. When the IP changes, it may not automatically update. Try restarting the web server after associating the Elastic IP.
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WordPress Configuration: WordPress might have hardcoded the original IP or domain in its configuration. Check your WordPress configuration files (particularly wp-config.php) and database for any hardcoded IP addresses or domain names.
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DNS Cache: The strange URL you're seeing (ec2-nnn-nnn-nnn-nnn.compute-1.amazonaws.com) is likely the public DNS name of your EC2 instance. Your local DNS cache might be holding onto old information. Try clearing your browser cache and local DNS cache.
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Security Group Rules: Although you mentioned that your security group allows HTTP traffic, double-check that it's configured to allow traffic from anywhere (0.0.0.0/0) on port 80.
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Network ACLs: If you're using custom Network ACLs, ensure they allow both inbound and outbound traffic on the necessary ports, including the ephemeral ports (1024-65535) for return traffic.
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Route Table: Verify that your subnet's route table includes a route for internet-bound traffic (0.0.0.0/0) pointing to the internet gateway.
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Instance Reboot: Sometimes, a full instance reboot can resolve connectivity issues, especially after IP changes.
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Windows Firewall (if applicable): If you're using a Windows instance, check that the Windows Firewall is not blocking incoming HTTP traffic.
The fact that you can curl the URL from within the instance suggests that the web server is running and accessible locally. This points to a networking or configuration issue rather than a problem with the web server itself.
To troubleshoot further, you could try:
- Checking the web server logs for any error messages
- Verifying that the web server is listening on all interfaces (0.0.0.0)
- Using tools like tcpdump or Wireshark to capture network traffic and see where the requests are getting stuck
If none of these solutions work, you might want to consider setting up an Elastic Load Balancer in front of your EC2 instance. This can provide a stable endpoint for your website while allowing you to change the underlying instance IP as needed.
Sources
webpage not accessible via Elastic IP on EC2 | AWS re:Post
Cannot access my ec2 instance from Public DNS or Public IP | AWS re:Post
Public IP address for EC2 not working | AWS re:Post
Tried everything to connect to EC2 Elastic IP from browser but its erroring out | AWS re:Post
Hello.
Based on what happened, I think it was possible that the WordPress site URL and WordPress URL settings were still set to the old public IP address.
Please try changing the settings in the "wp-config.php" file as described in the document below.
https://developer.wordpress.org/advanced-administration/upgrade/migrating/
define( 'WP_HOME', 'http://your-IP-Address' );
define( 'WP_SITEURL', 'http://your-IP-Address' );
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