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nginx: configuration file /etc/nginx/nginx.conf test failed (host not found in upstream)

Your problem is coming from this line:

proxy_pass http://www.class.com.192.168.33.10.xip.io:8055;

Most likely the server is having difficulty resolving that DNS name. You may also want to look at http://serverfault.com/questions/341810/nginx-failing-to-resolve-upstream-names-on-reload-even-if-they-do-resolve-by-the





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