Firewall Blocking Website Access

Can you post link to your site?

I checked your website in Safari, Chrome and Firefox and it works well. So probably issue is related to settings of firewall in your friend’s computer, not with your site.
Tip: if you link anywhere to your website, dont use www. for your domain, bc. you are not using it. You will avoid unnecessary redirection.

If you use Google webmaster tool, check your site there, it will show you if there is any issue.
If you don’t use it, try it, it can help you to find some issues on website, if exist.

Btw. nice simple theme.

No problems for me either.