Better error messaging when connecting to nzbget fails

src/NzbDrone.Core/Download/Clients/Nzbget/NzbgetProxy.cs

@@ -59,7 +59,7 @@ namespace NzbDrone.Core.Download.Clients.Nzbget
         {
             var protocol = settings.UseSsl ? "https" : "http";
 
-            var url = String.Format("{0}//{1}:{2}/jsonrpc",
+            var url = String.Format("{0}://{1}:{2}/jsonrpc",
                                  protocol,
                                  settings.Host,
                                  settings.Port);
@@ -85,13 +85,13 @@ namespace NzbDrone.Core.Download.Clients.Nzbget
         {
             if (response.ResponseStatus != ResponseStatus.Completed)
             {
-                throw new ApplicationException("Unable to connect to NzbGet, please check your settings");
+                throw new DownloadClientException("Unable to connect to NzbGet, please check your settings");
             }
 
             var result = Json.Deserialize<JsonError>(response.Content);
 
             if (result.Error != null)
-                throw new ApplicationException(result.Error.ToString());
+                throw new DownloadClientException("Error response received from nzbget: {0}", result.Error.ToString());
         }
     }
 }