can't load spreadsheet app

can't load spreadsheet app

Dear zoho team
 
 I have a problem with spreadsheet app, it won't be load, and it won't open a page sheet.zoho.com . All other aplications works, and i'm online, but when try to open spreadsheet page, it's telling me that IE cannot find server on sheet.zoho.com, and DNS error - server cannot be found.
Please for help! Yesterday at work all is working just fine and today at home  not working.
my username is celpro
 
thanks
DNS Error - Server cannot be found
Cannot find http://sheet.zoho.com/ DNS Error - Server cannot be found