Umbraco version 7.4.2

We get this error in our production env. The Error occurred when editing a User in back office. The timeout made the site unusable.

Exception occurred
System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 93.90.118.244:80
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)
   at System.Net.WebClient.DownloadString(Uri address)
   at dashboardUtilities.FeedProxy.Page_Load(Object sender, EventArgs e)

Why is Umbraco trying to contact 93.90.118.244 ? How do I disable this?

Our servers are not allowed to use the internet and therefore this call is blocked.

Regards,

Martin