nagios check_http returns error 500

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http://serverfault.com – Please help resolve the following problem. I am checking HTTP using Nagios and faced with the following error: check_http -H HTTP CRITICAL: HTTP/1.1 500 Internal Server Error - 3471 bytes in 0.104 second response time |time=0.103675s;;;0.000000 size=3471B;;;0 Toggle HighlightingOpen in New WindowSelect All I am trying to check if HTTP is available on my external server ( On that server I have nginx as a reverse proxy and Apache. Default directory for nginx is /usr/share/nginx/www which has a site in it with permissions as user:user. nginx is running under the www-data (HowTos)