Domain Mapping : Saying Health Status Invalid

I have install and configure Domain mapping plugin, but when i add mapped domain details in my created sub-site , its showing invalid health status, I had make all required setting related to CNAME and A Record, in my registrar , I also install and enable pro-sites, So Please Let us know what the actual problem , why showing invalid health status.
As i am facing problem with your late replies , its very disappointed, so please consider this as soon as possible.
Any help will be appreciated.