Server cannot resolve name

Can anyone help me figure out what is the problem. The server are not able to resolve a domain name, a clear example for this is this:

http://download.winzip.com/winzip90.exe
=> `winzip90.exe'
Resolving download.winzip.com... failed: Host not found.

Whenever the server need to resolve a name, it always unable to, even though the host is there.

Please help! Thanks.

 

 

 

 

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