1. The part of the error that says " upstream prematurely closed connection " means that the Nginx container was unable to get website content from the back-end website. According to NGINX docs the connect time out can't be longer than 75s "Defines a timeout for establishing a connection with a proxied server. At this time, gateway will take the disconnected connection request from the connection pool, resulting in an error Solution: Because the server is the provider and the gateway is the consumer, try to ensure that the consumer disconnects before the provider, and the time for setting Max idle time is not greater than connection timeout Labels. For some connections, we see connection getting closed with in 2 seconds and some times, it gets closed after 20 seconds etc. However, NGINX drops the connection exactly at 60 seconds -. I couldn't reproduce the problem on nginx for example. Hoxton.SR10 2020.0.1. The error log has the following entry in it nginx proxy client prematurely closed connection We're using nginx as a proxy. if we remove some claims and generate token, it goes through, but as the Authorization header size increases, we are getting Connection prematurely closed BEFORE response Client receives a response (as per tcpdump) Client closes its side of the connection, sending FIN segment to the server Client fails with "Connection prematurely closed BEFORE response" We're unable to reproduce the situation in our test environment, it happens purely in production. "upstream prematurely closed connection while reading response header from upstream". bug. This looks like long-running synchronous request - user uploads large file, it is being processed in the view which takes significant amount of time and only after a response to user's request is sent back. We are facing same issue. Everything works fine for a while and then all of the sudden the site stops working and requests keep timing out. Posted on; December 12, 2013. we are seeing sporadic nginx errors "upstream prematurely closed connection while reading response header from upstream" with nginx/1.6.2 which seems to be some kind of race condition. Sometimes my website will stop answering with errors HTTP 500 or HTTP 502. Our Server Experts can fix it for you in a few minutes. Nginx: upstream prematurely closed connection while reading response header from upstream. The value "always" will cause nginx to unconditionally wait for and process additional. Milestone. FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream ; upstream prematurely closed connection while >reading</b> response header from upstreamnginx. in our case, we have Bearer token which is large in size. 8 comments Assignees. . Then when running it I see a 502: bad gateway error. Add a route like this one in the main configuration file: Run the gateway behind a reverse proxy (Nginx in my case) Load test the gateway with a high number of requests/sec and many concurrent workers Set a value for the maxIdleTime ( null -> 100 ms) Set the pool type to FIXED instead of ELASTIC to avoid getting too much opened connections Here are the steps to fix NGINX: Upstream Closed Prematurely error. Controls how nginx closes client connections . Open NGINX configuration file Open terminal and run the following command to open NGINX configuration file. So, it is clear that the Website's Docker container has a faulty web server. Nginx500504500504 . the problem seems to be that whenever you use webclient, you have to return or use the response, otherwise it will close the connection and you didn't consume it yet, and you will see a lot of log messages saying that the connection close prematurely, if i had a scenario where a 404 status code is a error i could just use onstatus and throw an Some requests go to server A and others to server B. The main goal of this directive is to reset connections which timed out while sending a response. [ Not using Docker, and still getting this error? Pedro Carvalho Asks: NGINX - HTTP 500 upstream prematurely closed connection while reading response header from upstream We have an Apache server inside a docker container, and NGINX in another one as a proxy server. The default value "on" instructs nginx to wait for and process additional data from a client before fully closing a connection , but only if heuristics suggests that a client may be sending more data. My script continues to run and completes after 70 seconds, however my browser connection has died before then (502 error). we are seeing sporadic nginx errors "upstream prematurely closed connection while reading response header from upstream" with nginx/1.6.2 which seems to be some kind of race condition. workaround: Instead of doing WebClient.create(url), use the builder and create a new connection: . The script installed nginx and mono and setup the nginx.conf and other configuration files. 2015/06/01 18:48:07 [error] 82618#0: *5006 upstream prematurely closed connection while reading response header from upstream, client: . The option "uwsgi_read_timeout" does its job for anything less than 60 . While processing file where is no response back to user and gunicorn worker is killed due to timeout. What I then did was remove this installation, installed postgresql and setup the database, and replaced the files in $HOME/www/ with my own MVC 4 web application which works locally by copying it there. For debugging purposes we only setup 1 upstream server on a public IP address of the same server as nginx, there is no keepalive configured Nginxrecv() failed (104: Connection reset by peer) while reading response header from upstream ; . Increase Proxy Timeout Add these following lines to increase proxy timeout for upstream server. Hello, . $ sudo vi /etc/nginx/nginx.conf 2. 5 comments Closed . It should be noted that this timeout cannot usually exceed 75 seconds." - Richard Herries Jan 30, 2019 at 8:11 Projects. This is what making us believe that there is some network issue between these VM's or some issue with the application load balancer itself. Asked by hn. 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