I have recently mapped these sites.every thing was working

Hi,

I have recently mapped these sites.every thing was working fine till couple of hours ago from now.I ant access these sites.There isn't any issue with my internet connection etc as i can access every other site on other servers but not these on this server.I have attached a screen shot for the error also.Please help asap.
demo.instrinsicstrength.com
demo.selfmindbody.com
demo.peaceandpresence.com
demo.fantasticimpact.com
demo.inkimpact.com

Please come back to em asap.

Thanks.

Sean