robocop_911

Hello, I've installed apache, since two days I've been trying to fix this problem. I can't access index.html in htdocs directory from internet, although I can access it locally by typing http://localhost/ from the computer hosting the server but *not* from somewhere else! I've forwarded port 80 and checked it at www.canyouseeme.org and it says "Port 80 is open - your ISP is *not* blocking it", but still I can't access my website from other computer! I've also tried changing port to 8000 and changed the httpd.conf file to "Listen 8000", but still *same* thing whenever I type my public IP address on the browser it says "server is taking too long to respond". What should I do now?