The Remote server returned an error (404) not found in SharePoint Client Context code

Hello,

It seems there is problem with permission that's why 404 is returning. Have you tried to add credential in your code? If not then do so

using (var context = new ClientContext("site URL"))
{
    context.Credentials = new NetworkCredential("userName", "Userpassword", "domain");
    var site = context.Web;
    context.Load(site, s => s.Title);
    context.ExecuteQuery();
    Console.WriteLine(site.Title);
    Console.ReadLine();
}

If still face issue then share your code with us.

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Hemendra:Yesterday is just a memory,Tomorrow we may never see<br/> Please remember to mark the replies as answers if they help and unmark them if they provide no help