404 Not Found (nginx/1.3.7)

[EGR MILWAUKEE]

there is a plugin i used called "WP No External Links"
i used it to mask all external links to appear like that "Click Here"

and it worked very great but since 2 weeks it bring error
called "404 Not Found" (nginx/1.3.7) when i try to click on the links

so i made ticket at host company and the admin said
he modified nginx configuration but it didn't fix yet

and i have another site but works fine with this plugin
so how to copy configuration from server to another
or anyone know how to config nginx file in kloxo

Thanks Did your hosting company checked error logs?