title: WebResource.axd throwing exceptions in web farm
body: <p>We have an array of about 12 servers serving a website. Over the past few hours, one single server has started throwing exceptions for WebResource.axd and ScriptResource.axd requests.</p>
  
  <p><strong>Exception</strong></p>
  
  <p>System.Web.HttpException - This is an invalid script resource request.</p>
  
  <p><strong>Stack Trace</strong></p>
  
  <p>at System.Web.Handlers.ScriptResourceHandler.ProcessRequest(HttpContext context)<br>
  at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()<br>
  at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously)  </p>
  
  <p><strong>Broken server URL</strong></p>
  
  <p>/WebResource.axd?d=S6kjkBsrIKni9uO5HCkv0c8eYObzibWXn9R6A7Yr_Fy7CW4dRFZm1HfcnUTEZ8xBYZDM-5zeTVk1tTgC1hp7d5YYw3o1&amp;t=634308186300177825</p>
  
  <p><strong>All other servers URL</strong></p>
  
  <p>/WebResource.axd?d=yj6PW1hbOvqhMkOh2gYGlw2&amp;t=634207187366247462</p>
  
  <p>I have checked the web.config, machine.config for every server and they're all identical. The only difference been able to find so far is that prior to the problem commencing, the servers were patched, after which, the problematic server looks to be using different version of the System.Web.dll to the others?</p>
  
  <p>Any ideas?</p>