Fixed: Better error message for DNS exceptions on mono.

src/NzbDrone.Common/Http/Dispatchers/ManagedHttpDispatcher.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Net;
 using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Extensions;
@@ -72,8 +72,20 @@ namespace NzbDrone.Common.Http.Dispatchers
                 httpWebResponse = (HttpWebResponse)e.Response;
 
                 if (httpWebResponse == null)
+                {
+                    // The default messages for WebException on mono are pretty horrible.
+                    if (e.Status == WebExceptionStatus.NameResolutionFailure)
+                    {
+                        throw new WebException($"DNS Name Resolution Failure: '{webRequest.RequestUri.Host}'", e.Status);
+                    }
+                    else if (OsInfo.IsNotWindows)
+                    {
+                        throw new WebException($"{e.Message}: '{webRequest.RequestUri}'", e.Status);
+                    }
+                    else
                     {
                         throw;
+                    };
                 }
             }