Have you tried to 'reload' the server by sending SIGHUP to the master
process? Or if this is not enough try upgrading it on the fly or restart
(stop/start) it.
Nginx, as any process, cannot detect system changes such as this ones on
its own...
If you modiify your hardware environment, you need to 'refresh' all your
process based on the new one.
---
*B. R.*
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