issue and vhost-error

[ghost]

Hello mate, I found some issue after compiling anddos with nginx, I found that error on vhost-error.log

2014/08/15 12:42:33 [error] 17499#0: *10350 ANDDOS mime: text/html; charset=utf-8 while reading response header from upstream, client: 212.126.112.5, server: amigoserv.com, request: "GET / HTTP/1.1", upstream: "http://176.31.18.147:81/", host: "amigoserv.com", referrer: "http://4upfiles.com/Ofiles.php"
2014/08/15 12:42:33 [error] 17499#0: *10352 ANDDOS mime: text/html; charset=utf-8 while reading response header from upstream, client: 188.50.144.35, server: amigoserv.com, request: "GET / HTTP/1.1", upstream: "http://176.31.18.147:81/", host: "amigoserv.com", referrer: "http://4upfiles.com/Ofiles.php"
2014/08/15 12:42:33 [error] 17499#0: *10357 ANDDOS mime: text/javascript; charset=utf-8 while reading response header from upstream, client: 88.21.242.241, server: amigoserv.com, request: "GET /modules/livehelp/include/status.php?callback=_jqjsp&DATA=eyJKU09OIjoiIiwiSU5JVElBVEUiOiIiLCJTRVNTSU9OIjoiMGJzYzJpYndxZ2wyMnZ2d2U2OWUwYThlODNjNmU4Y2RjODczZWZhMGYwYjNlNzEwYjBkYjkyNzg3TzErSFN6REZtMGtkMUI1OUVReXA0UXRxWU5aQjJBMXMwTzlxaThXMHZRPSJ9&1408095750964= HTTP/1.1", upstream: "http://176.31.18.147:81/modules/livehelp/include/status.php?callback=_jqjsp&DATA=eyJKU09OIjoiIiwiSU5JVElBVEUiOiIiLCJTRVNTSU9OIjoiMGJzYzJpYndxZ2wyMnZ2d2U2OWUwYThlODNjNmU4Y2RjODczZWZhMGYwYjNlNzEwYjBkYjkyNzg3TzErSFN6REZtMGtkMUI1OUVReXA0UXRxWU5aQjJBMXMwTzlxaThXMHZRPSJ9&_1408095750964=", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:35 [error] 17499#0: *10364 ANDDOS mime: text/javascript; charset=utf-8 while reading response header from upstream, client: 188.50.144.35, server: amigoserv.com, request: "GET /modules/livehelp/include/settings.php?callback=jQuery172007154697272926569_1408095750154&JSON=&SESSION=julk2770h7r2kzykfdec535c7c918e6c9c4459cae4daed51cbe0459bVOzye2EEgqjLpBkhAOtxSUW9yXPDnAW8G3abD0B%2FTiA%3D&LANGUAGE=en&=1408095751203 HTTP/1.1", upstream: "http://176.31.18.147:81/modules/livehelp/include/settings.php?callback=jQuery172007154697272926569_1408095750154&JSON=&SESSION=julk2770h7r2kzykfdec535c7c918e6c9c4459cae4daed51cbe0459bVOzye2EEgqjLpBkhAOtxSUW9yXPDnAW8G3abD0B%2FTiA%3D&LANGUAGE=en&_=1408095751203", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:35 [error] 17499#0: *10369 ANDDOS mime: application/javascript while reading response header from upstream, client: 212.126.112.5, server: amigoserv.com, request: "GET /includes/jscript/jquery.js HTTP/1.1", upstream: "http://176.31.18.147:81/includes/jscript/jquery.js", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:35 [error] 17499#0: *10376 ANDDOS mime: text/css while reading response header from upstream, client: 212.126.112.5, server: amigoserv.com, request: "GET /templates/FirstHostingNew/glossy-buttons.css HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/glossy-buttons.css", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:35 [error] 17499#0: *10378 ANDDOS mime: text/css while reading response header from upstream, client: 212.126.112.5, server: amigoserv.com, request: "GET /templates/FirstHostingNew/html/css/style.css HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/html/css/style.css", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:35 [error] 17499#0: *10372 ANDDOS mime: application/javascript while reading response header from upstream, client: 212.126.112.5, server: amigoserv.com, request: "GET /templates/FirstHostingNew/js/whmcs.js HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/js/whmcs.js", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:35 [error] 17499#0: *10371 ANDDOS mime: text/css while reading response header from upstream, client: 212.126.112.5, server: amigoserv.com, request: "GET /templates/FirstHostingNew/css/whmcs.css HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/css/whmcs.css", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:35 [error] 17499#0: *10386 ANDDOS mime: image/png while reading response header from upstream, client: 197.160.97.74, server: amigoserv.com, request: "GET /templates/FirstHostingNew/html/images/mainBoxTop.png HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/html/images/mainBoxTop.png", host: "www.amigoserv.com", referrer: "http://www.amigoserv.com/templates/FirstHostingNew/html/css/style.css"
2014/08/15 12:42:36 [error] 17499#0: *10386 ANDDOS mime: image/png while reading response header from upstream, client: 197.160.97.74, server: amigoserv.com, request: "GET /modules/livehelp/locale/en/images/Offline.png HTTP/1.1", upstream: "http://176.31.18.147:81/modules/livehelp/locale/en/images/Offline.png", host: "www.amigoserv.com", referrer: "http://www.amigoserv.com/"
2014/08/15 12:42:36 [error] 17499#0: *10392 ANDDOS mime: text/html; charset=utf-8 while reading response header from upstream, client: 197.41.66.130, server: amigoserv.com, request: "GET / HTTP/1.1", upstream: "http://176.31.18.147:81/", host: "amigoserv.com", referrer: "http://4upfiles.com/Ofiles.php"
2014/08/15 12:42:36 [error] 17499#0: *10386 ANDDOS mime: image/png while reading response header from upstream, client: 197.160.97.74, server: amigoserv.com, request: "GET /templates/FirstHostingNew/html/images/textField.png HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/html/images/textField.png", host: "www.amigoserv.com", referrer: "http://www.amigoserv.com/templates/FirstHostingNew/html/css/style.css"
2014/08/15 12:42:39 [error] 17499#0: *10430 ANDDOS mime: text/html; charset=utf-8 while reading response header from upstream, client: 41.237.45.171, server: amigoserv.com, request: "GET / HTTP/1.1", upstream: "http://176.31.18.147:81/", host: "amigoserv.com", referrer: "http://4upfiles.com/Ofiles.php"
2014/08/15 12:42:40 [error] 17499#0: *10445 ANDDOS mime: text/html; charset=utf-8 while reading response header from upstream, client: 197.160.161.142, server: amigoserv.com, request: "GET / HTTP/1.1", upstream: "http://176.31.18.147:81/", host: "amigoserv.com", referrer: "http://4upfiles.com/Ofiles.php"
2014/08/15 12:42:41 [error] 17499#0: *10386 ANDDOS mime: image/png while reading response header from upstream, client: 197.160.97.74, server: amigoserv.com, request: "GET /templates/FirstHostingNew/html/images/mainBoxBottom.png HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/html/images/mainBoxBottom.png", host: "www.amigoserv.com", referrer: "http://www.amigoserv.com/templates/FirstHostingNew/html/css/style.css"
2014/08/15 12:42:41 [error] 17499#0: *10461 ANDDOS mime: text/css while reading response header from upstream, client: 197.160.161.142, server: amigoserv.com, request: "GET /templates/FirstHostingNew/html/css/slider.css HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/html/css/slider.css", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:41 [error] 17499#0: *10466 ANDDOS mime: application/javascript while reading response header from upstream, client: 197.160.161.142, server: amigoserv.com, request: "GET /templates/FirstHostingNew/js/whmcs.js HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/js/whmcs.js", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:41 [error] 17499#0: *10468 ANDDOS mime: application/javascript while reading response header from upstream, client: 197.160.161.142, server: amigoserv.com, request: "GET /includes/jscript/jquery.js HTTP/1.1", upstream: "http://176.31.18.147:81/includes/jscript/jquery.js", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:41 [error] 17499#0: *10445 ANDDOS mime: application/javascript while reading response header from upstream, client: 197.160.161.142, server: amigoserv.com, request: "GET /templates/FirstHostingNew/html/js/hoverIntent.js HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/html/js/hoverIntent.js", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"
2014/08/15 12:42:41 [error] 17499#0: *10471 ANDDOS mime: text/html; charset=utf-8 while reading response header from upstream, client: 196.218.117.116, server: amigoserv.com, request: "GET / HTTP/1.1", upstream: "http://176.31.18.147:81/", host: "amigoserv.com", referrer: "http://4upfiles.com/Ofiles.php"
2014/08/15 12:42:42 [error] 17499#0: *10475 ANDDOS mime: text/css while reading response header from upstream, client: 196.218.117.116, server: amigoserv.com, request: "GET /templates/FirstHostingNew/css/bootstrap.css HTTP/1.1", upstream: "http://176.31.18.147:81/templates/FirstHostingNew/css/bootstrap.css", host: "www.amigoserv.com", referrer: "http://amigoserv.com/"

this error repeats after each visit to the site

so what is that? and How can I fix it?

Thank You so much