codeigniter - nginx + fastCGI stops servering php after a couple of refreshes -

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i setup new centos server nginx , fastcgi. followed linode article installed , configured http://library.linode.com/lemp-guides/centos-5/ . seems work fine, until refresh page couple times. after 2 refresh nginx stops serving php , gives me error. if load php page in different browser, work again, until fresh. there kind of arbitrary limit on number of requests session can make?

i'm new nginx. i'm more comfortable apache configs. i'm sure it's in nginx.conf. other pointing locations directory php is, didn't change of default configs in /etc/nginx.conf.

i don't think matters, it's running codeigniter application.

thanks.


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