This could be because of DNS server is not responding or {0}Hostname cannot be found in the database(s) being queried. or ...

{0}This could be because of DNS server is not responding or {0}Hostname cannot be found in the database(s) being queried. or {0}You may have modified your hosts file which allows you to override the DNS for a domain, on this machine. or {0}You may have configured Proxy auto configuration (PAC) which determines appropriate proxy for each URL.{0}Please provide this information to your administrator for further assistance.