title: Asp.net Images are giving 401 unauthorized error randomly
body: <p>I am using Asp.net, IIS 6 and cdn for serving images. 
  I am having a problem with loading the images in my website. images are under a virtual folder. Everytime I hit refresh of the browser, some of the images  gives 401 unauthorized error. (images and number of images displayed which gives 401 error differs in every refresh.) 
  I am having hard time to solve this problem. Any help will be welcomed a lot.</p>
  
  <p>Kind Regards.</p>
  
  <p>PS: I am also using a load balancer to distribute traffic among two servers. One of the servers has actual files and a virtual folder for them. The other server has virtual folder which shows the path and ip of the server which has files. I tried using website via each server but they both have the same problem.</p>
  
  <p>Here are the headers;</p>
  
  <p><strong>Response:</strong> </p>
  
  <pre><code>HTTP/1.1 401 Unauthorized
  Content-Length: 1608
  Content-Type: text/html
  Server: Microsoft-IIS/6.0
  Date: Thu, 28 Apr 2011 14:38:55 GMT
  </code></pre>
  
  <p><strong>Request</strong></p>
  
  <pre><code>GET /img/blog/2011%2f4%2f4.png HTTP/1.1
  Host: cdn.***.com
  User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.2.16) Gecko/20110319 Firefox/3.6.16 ( .NET CLR 3.5.30729)
  Accept: image/png,image/*;q=0.8,*/*;q=0.5
  Accept-Language: en-gb,en;q=0.5
  Accept-Encoding: gzip,deflate
  Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
  Keep-Alive: 115
  Connection: keep-alive
  Referer: http://www.***.com/Blog
  </code></pre>