errors in configuration
There is a more update version. Its on version 3.0 there up to version 3.1
The install instructions are incorrect.
the file /etc/nginx/sites-enabled/default
has this line
proxy_set_header X-Graylog-Server-URL http://$server_name/api;
it should be
proxy_set_header X-Graylog-Server-URL http://$server_name;
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