An sudden connection closing by the client (often a browser or other software) before the server could finish processing the request is shown by a Nginx error code 499. At Bobcares, we assist our customers with several NGINX queries on a daily basis as part of our Server Management Services.
Overview
Fixing Nginx Error code 499
This occurs when the client (like a browser) closes the connection before the server finishes processing. It indicates an issue on the client side, unlike a typical 502 Bad Gateway error.
Common Causes
1. Client-side Timeout: The client’s connection times out while waiting for a server response.
2. User Canceled Request: The user stops the request in their browser or application.
3. Network Issues: Instability or interruptions cause the connection to drop.
4. High Server Load: Overloaded servers take longer to process requests, leading to timeouts.
5. Conflicting Requests: Multiple requests from the same client interfere with each other.
Troubleshooting Steps
1. Check Logs:
tail -f /var/log/nginx/access.log
2. Increase Client Timeout:
http {
send_timeout 120s;
…
}
3. Optimize Server Performance: Improve backend services and Use caching for faster responses.
4. Monitor Client Behavior: Identify if specific clients or actions cause errors and optimize those areas.
5. Check Load Balancer Configuration: Ensure it’s set to handle long-running connections and timeouts.
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Conclusion
To sum up, NGINX Error Code 499 shows that a client has closed the connection before the server was able to send a response. Here, we’ve provided the troubleshooting steps from our Tech team.
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