Unable view SSL Website

I have installed a ssl certificate for a domain. After restarting iis I am getting error message as

'The connection was interrupted

The connection to www.proburn.com was interrupted while the page was loading.

*   The site could be temporarily unavailable or too busy. Try again in a few
      moments.

*   If you are unable to load any pages, check your computer's network
      connection.

*   If your computer or network is protected by a firewall or proxy, make sure
      that Firefox is permitted to access the Web.

So please guide me to fix this issue

Hi,

We checked your website https://www.proburn.com and found that root and intermediate certificate have not installed properly.

Follow the instruction from this link for installation of root and intermediate certificates below.

https://support.comodo.com/index.php?_m=knowledgebase&_a=view&parentcategoryid=88&pcid=1&nav=0,1

For more help, please submit a ticket at https://support.comodo.com/ with order# and error screenshot that will help us to serve you better.