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Orbited proxied by nginx hangs web traffic for particular user - 11 years ago

We are using nginx -> Orbited for long-polling, nginx -> uwsgi for web content (AJAX-driven), and nginx for static files. Problem is, when user open more than, dunno, about 6-7 tabs in browser. Then, traffic for user (and just for him) just hangs. All new requests takes too long. Is there particular config option in nginx or Linux that limits these connections? Or there is problem with somet