444 Connection Closed Error: Nginx Configuration Solution

Hands-on with proxy IPs to eliminate Nginx's 444 error reporting

In the past two days, I've been helping customers troubleshoot their servers and found an interesting phenomenon: when accessing with proxy IPs, I often encounteredSuddenly the connection is interrupted.In this case, the Nginx logs are clear of 444 status codes. This broken error is like your home wifi brush video suddenly disconnected, especially affecting business continuity. Today, we will break down and talk about how to use ipipgo's proxy service to cure this problem.

What the hell is wrong with error 444?

Simply put, the serverHang up unilaterally. Commonly found in three situations:
1. Client hangs up before finishing (disconnects before request is completed)
2. The server does not want to answer the call (active shutdown of the connection)
3. Call time being pinched (timeout set too short)

Especially when using a proxy IP, because of the extra "messenger" in the middle, it's more likely to happen.miscommunicationThe situation. For example, if the proxy server responds slowly, the Nginx side can't wait and just hangs up.

Tuning of key configuration parameters

 Adjust these three life-preserving parameters
proxy_connect_timeout 75s; handshake wait timeout
proxy_send_timeout 1800s; send data timeout
proxy_read_timeout 1800s; read response timeout

 Connection Pool Configuration (units adjusted as appropriate)
proxy_temp_path /var/nginx/proxy_temp.
proxy_cache_path /var/nginx/proxy_cache levels=1:2 keys_zone=ipipgo_proxy:10m max_size=1g;

Here's the kicker.proxy_read_timeout: This parameter determines the value of patience for responses from Nginx and others. If you use ipipgo's dynamic residential proxy, it is recommended to set it to1800 seconds or moreAfter all, the real user network environment is complex.

Special Handling Tips for Proxy IPs

Remember to add these two configurations when using ipipgo's proxy service:

proxy_set_header X-Real-IP $proxy_add_x_forwarded_for;
proxy_http_version 1.1; must use version 1.1 protocol

This is equivalent to giving each requestStick a courier number on it., allowing the back-end to accurately identify the source of the request. It has been tested to reduce the number ofAbnormal interruptions above 30%, especially with mobile agents.

A practical guide to avoiding the pit

Recently encountered a typical case: an e-commerce customer used our ipipgo static business proxy, but still dozens of 444 errors per hour. In the end, it was found to beKeepAlive is not configured., adjustments were made with immediate effect:

keepalive_timeout 650s; long connection keepalive timeout
keepalive_requests 1000; maximum number of requests for a single connection

Here's one.Hidden TipsIf the proxy IP switching frequency is high (e.g. with dynamic pools), it is recommended to set the keepalive_timeout shorter.About 300 seconds.More appropriate.

Frequently Asked Questions First Aid Kit

Q：Why does it still report 444 even though the timeout parameter has been increased?
A: eighty percentFireproofing.If the session hold time of iptables or cloud security group is checked, it is recommended to synchronize and adjust it to more than 3600 seconds.

Q: Do I need to set up special SSL settings to use a proxy IP?
A: ipipgo's proxy supports SSL penetration by default, but it is recommended to add this configuration for more stability:

proxy_ssl_server_name on; proxy_ssl_session_reuse off; proxy_ssl_session_reuse
proxy_ssl_session_reuse off.

Why do you recommend ipipgo?

To handle this type of connection interruption problem, the proxy service'squality stabilityCritical. Our technological advantage is:

in particularCommercial Static Agentproduct, optimized for scenarios that require long connections, supports TCP connection holding12 hours without interruption, which perfectly matches Nginx's long timeout configuration.

The Ultimate Solution

If you still have problems after tuning the parameters, go directly to ourIntelligent Routing AgentService. By automatically selecting the optimal line + protocol optimization, it is able to keep the 444 error rate down toBelow 0.1%. Configuration example:

location / {
    proxy_pass http://ipipgo_proxy;
     Intelligent retry mechanism
    proxy_next_upstream error timeout http_444; proxy_next_upstream_tries 3;
    proxy_next_upstream_tries 3; proxy_next_upstream_timeout 60s; proxy_next_upstream_timesout 60s
    proxy_next_upstream_timeout 60s; proxy_next_upstream_tries 3; proxy_next_upstream_timeout 60s.
}

This configuration is equivalent to buying the requesttriple insurance, together with ipipgo's millions of IP pools, you can basically say bye-bye to 444 errors.

Don't beat around the bush when it comes to specific issues, our technical team offers1-to-1 configuration guidanceAfter all, each business scenario is different. After all, each business scenario is different, some customers need to adjust the buffer, some to optimize DNS resolution, the right medicine is the king.