no such host name NET

I have a web page being hosted on my web server which is working fine in the building i work from however another building gets the following error

No such host is known
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Net.Sockets.SocketException: No such host is known

Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[SocketException (0x2af9): No such host is known]
   System.Net.Dns.GetAddrInfo(String name) +471
   System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6, Boolean throwOnFailure) +125
   System.Net.Dns.GetHostEntry(String hostNameOrAddress) +5327211
   _Default.Page_Load(Object sender, EventArgs e) +82
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +50
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627


the other building are able to ping the web server so i dont know why it wont work?
LBGUC04Asked:
Who is Participating?
 
ABLComputersCommented:
The problem that you're having seem to be a DNS problem. On your DNS server you'll need to create a new host and point it to the server's IP address that is hosting the website.

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LBGUC04Author Commented:
i found the problem in the below code thanks for your help

System.Net.Dns.GetHostEntry(Request.ServerVariables["REMOTE_HOST"]).HostName
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Zapato CaféCommented:
i have a problema witch internet explorer, but Firefox ok
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