EC2 Website Connection Timeout
Hi,
I’m unable to connect to a public-facing web app hosted on an EC2 instance. It was working fine yesterday. Now, I receive the following browser errors:
What could be possible cause of this error and Any recommendation to fix this error.
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When you encounter a connection timeout error for a website hosted on an EC2 instance that was previously working, there are several potential causes to investigate:
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Security Group Configuration: Verify that your EC2 instance's security group allows incoming traffic on ports 80 (HTTP) and 443 (HTTPS) from all sources (0.0.0.0/0).
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Web Server Status: Your web server (Apache, Nginx, etc.) might have stopped running. Try restarting the web server service on your EC2 instance.
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Database Connection Issues: If your website relies on a database (like RDS), check if the connection count is 0 or if there are connectivity issues between your EC2 and the database. Test the database connection using command-line tools.
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Network Configuration: Ensure that your subnet's route table includes a route for internet-bound traffic pointing to the internet gateway.
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IP Address Changes: If you recently associated or disassociated an Elastic IP, your web server configuration might need to be updated to reflect the new IP address.
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Application Configuration: Your application might have hardcoded IP addresses or domain names that need to be updated.
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Instance Health: Check if your EC2 instance is experiencing high CPU usage or other performance issues.
To troubleshoot and fix this issue:
- SSH into your EC2 instance to verify it's running properly.
- Check your web server logs for any error messages.
- Restart your web server service.
- Verify that your application can connect to any required databases.
- If you recently made DNS changes, be aware that propagation can take up to 48 hours.
- Try accessing the site using the EC2 instance's public IP directly to rule out DNS issues.
- As a last resort, consider restarting the EC2 instance.
Sources
EC2 Instance that get ERR_CONNECTION_TIMED_OUT | AWS re:Post
Troubleshoot connection errors | AWS re:Post
Suddenly the domain connection fails. | AWS re:Post
No longer have http access to EC2 instance after elastic IP associated | AWS re:Post
