Without knowing details this sounds very much like the stuck clients issue Armin Ronacher complains about here: http://lucumr.pocoo.org/2012/6/26/disconnects-ar

Without knowing details this sounds very much like the stuck clients issue Armin Ronacher complains about here: http://lucumr.pocoo.org/2012/6/26/disconnects-are-good-for-you/ http://lucumr.pocoo.org/2012/6/26/disconnects-are-good-for-y... (discussed here https://news.ycombinator.com/item?id=4161073 https://news.ycombinator.com/item?id=4161073) In a nutshell if the server goes away while a client is in recv the client will never know and waits forever.