title: WebResource.axd - Invalid ViewState
body: <p>I keep seeing these errors in our error log.  Any ideas how i can figure out where its coming from, or better yet how to fix the problem?</p>
  
  <blockquote>
    <p>System.Web.HttpException: Invalid viewstate. at
    System.Web.UI.Page.DecryptString(String s) at
    System.Web.Handlers.AssemblyResourceLoader.System.Web.IHttpHandler.ProcessRequest(HttpContext
    context) at
    System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
    Boolean&amp; completedSynchronously)</p>
  </blockquote>
  
  <p><strong>Update</strong>
  Here is what I have tried so far - we are running a single web server (no farm)</p>
  
  <ul>
  <li>Adding a Machine Key value to web.config</li>
  </ul>