Maxim Dounin Wrote: ------------------------------------------------------- > There is proxy_read_timeout (http://nginx.org/r/proxy_read_timeout) > which as well applies to WebSocket connections. You have to bump > it if your backend do not send anything for a long time. > Alternatively, you may configure your backend to send websocket > ping frames periodically to reset the timeout (and check if the > connection is still alive). Thanks, raising the timeout resolved the problem. Posted at Nginx Forum: http://forum.nginx.org/read.php?2,236382,236386#msg-236386