Show inner exception if SSL connection fail when changing domain

BTCPayServer/BTCPayServer.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.1</TargetFramework>
-		<Version>1.0.2.64</Version>
+		<Version>1.0.2.65</Version>
     <NoWarn>NU1701,CA1816,CA1308,CA1810,CA2208</NoWarn>
   </PropertyGroup>
   <ItemGroup>

BTCPayServer/Controllers/ServerController.cs

@@ -208,7 +208,11 @@ namespace BTCPayServer.Controllers
                     }
                     catch (Exception ex)
                     {
-                        ModelState.AddModelError(nameof(vm.DNSDomain), $"Invalid domain ({ex.Message})");
+                        var messages = new List<object>();
+                        messages.Add(ex.Message);
+                        if (ex.InnerException != null)
+                            messages.Add(ex.InnerException.Message);
+                        ModelState.AddModelError(nameof(vm.DNSDomain), $"Invalid domain ({string.Join(", ", messages.ToArray())})");
                         return View(vm);
                     }
                 }