The remote name could not be resolved while using HttpWebRequest

The issue could be because of proxy setting not specified for the web application. The solution to this is to add the following conifig info in the application’s web.config
<system.net><defaultProxy  enabled=“true” useDefaultCredentials=“true“>
<proxy  bypassonlocal=“True”  proxyaddress=“proxyaddress“ />
</defaultProxy> 
</system.net> 

Hope it helps.