> nginx version: nginx/1.2.6
> built by gcc 4.4.4 20100726 (Red Hat 4.4.4-13) (GCC)
> [...]
> CentOS 6.7 server

Try disabling kerberos cipher suites [1], you may be hitting
some obscure CentOS/RedHat libc issues [2].

[1] https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=nginx-1.2.6&openssl=1.0.1e&hsts=no&profile=old
[2] http://blog.tinola.com/?e=36


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