Browser Connection Reset - ASP.NET MVC only when returning model with more than N elements

I am working on a ASP.NET MVC application. There are partial views, a controller, handler and a model that is iterated and its items are displayed on view. It works fine, until I get more than 25 elements in my list. If I return 26 elements it starts showing a "The connection was reset" message in the browsers(FF and Chrome):

These are the partial views:

Iterating model items:

@foreach(ingredientsListItemModel ingredientsListItem in Model.ingredientsListItems)
    {
        <text>
            <div id="@ingredientsListItem.ContainerDiv">
                @Html.Partial("Partial/ingredientsListItem", ingredientsListItem)
            </div>    
        </text>
    }

Showing each item as a container:

@using (Ajax.BuildForm("AddElement", "Item", Model.FormId, new AjaxOptions { UpdateTargetId = Model.ContainerDiv }))
{
    <div id="ingredientsListitem" class="yui3-g ingredientsListitem">
        <div class="yui3-u-1-3">
            <a href="@url">
                <img src="@Model.ImageUrl" alt="" />
            </a>
        </div>
        <div class="yui3-u-2-3">
            <div class="itemdescription">
                <a href="@url">
                    @MvcHtmlString.Create(Model.ItemDescription)
                </a>
            </div>
        </div>
    </div>
    @Html.HiddenFor(m => m.ingredientsListId);
}

These are the controller methods to have an idea of the data:

Controller:

public ActionResult GetingredientsList()
        {
            if (Request.IsAjaxRequest())
            {
                return PartialView("Partial/ingredientsList", Handler.GetingredientsListModel(MvcApplication.ClientApplication));
            }

Handler:

  private static IEnumerable<ingredientsListItemModel> GetingredientsListItems(ClientApplication clientApplication)
        {
//Some code...
            return list.ToList();
//if this list contains more than 25 elements it starts failing and showing the Connection reset error.
        }

I tried changing the web.config to include (but it didn't work):

<configuration> 
   <system.web.extensions>
       <scripting>
           <webServices>
               <jsonSerialization maxJsonLength="50000000"/>
           </webServices>
       </scripting>
   </system.web.extensions>
</configuration> 

No matter which element is in the list, it can be any data but once it is bigger than 25 items, it fails. I am thinking there could be a response size limit to be changed in some way? in IIS? in web.config? It seems it is a size limit problem. Well, any help will be very appreciated.