connection forcibly closed by remote host when authenticating

I am attempting to authenticate with the REST API, but sending the request through a MVC Web application always provides the error message "An existing connection was forcibly closed by the remote host". It appears to be a request timeout, as the error always occurs after 1 min of attempting to connect.

This only occurs when I am attempting to connect through the MVC web application, while a .NET Console program allows a connection and returns a session token.

The block of code used is the same in both the web application and the console program, which is taken from the tutorials.

Uri dssUri = new Uri("https://hosted.datascopeapi.reuters.com/RestApi/v1/");
string dssUserName = "<username>";
string dssUserPassword = "<password>";

ExtractionsContext extractionsContext = new ExtractionsContext(dssUri, dssUserName, dssUserPassword);

string sessionToken = extractionsContext.SessionToken;
Console.WriteLine("Returned session token: " + sessionToken);
return sessionToken;

EDIT:

The problem was fixed by adding a default proxy to the Web.config file in the webapp.

  <system.net>  
	<defaultProxyenabled="true"useDefaultCredentials="true"></defaultProxy>
  </system.net>