Error while accessing webservices

When I try to access a webservice from inside a client service application, I get the following error. It is intermittent though. I get this error and seems to fix itself after a few minutes or so. Please help how can I fix this.
       
System.Net.WebException: The remote name could not be resolved: 'apps.wsifb.com'
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Prashant JagdaleCommented:
It is due to your application is not be able to resolve the 'apps.wsifb.com'. Please add a host file entry for this on your client machine.

go to the :
%SystemRoot%\system32\drivers\etc\

edit the "hosts" file in note pad and add a entry like below:

ipaddress  url
e. g. 127.0.0.1  localhost
0

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