c# SharePoint 2010

The code below works when I point it to two of my three SharePoint servers.  My third server I get 401 error.  Any ideas anyone ?

    private void button3_Click(object sender, EventArgs e)
      {
        label3.Text = "";
        try
        {
          treeview1.Nodes.Clear();
          ClientContext clientContext = new ClientContext(comboBox1.Text);
          Web oWebsite = clientContext.Web;
          ListCollection collList = oWebsite.Lists;
          clientContext.Load(collList);
          clientContext.ExecuteQuery();
          foreach (SP.List oList in collList)
          {
            TreeNode listnode = new TreeNode();
            listnode.Text = oList.Title;
            treeview1.Nodes.Add(listnode);
          }
        }
        catch (Exception ex)
        { label3.Text = ex.Message; }
      }  

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DemosthenesAsked:
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Jamie McAllister MVPSharePoint ConsultantCommented:
Are you using Kerberos?
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DemosthenesAuthor Commented:
Yes
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Jamie McAllister MVPSharePoint ConsultantCommented:
I've heard of this one but happily not experienced it myself. Incorrect Kerberos config causing custom code to fail authentication on one WFE but not others.

These are the closest resources I can find to addressing this;

http://www.bryansgeekspeak.com/2010/11/sharepoint-2010-on-windows-server-2008.html

http://sharepoint.aspcode.net/view/63539928672422258266802/why-does-kerberos-authentication-fail

http://technet.microsoft.com/en-us/library/gg502602(v=office.14).aspx
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DemosthenesAuthor Commented:
Through reading these articles I installed Fiddler, and watched my transaction.  Something about the hostname looked odd to me so I used IP address instead.  Code now works.  The hostname of course works when you put it in a browser, but not in my code.  

"http://sp1" is a browsable sharepoint server, but this line doesn't like it:
ClientContext clientContext = new ClientContext(comboBox1.Text);

I am having my server team put in a nice DNS entry for the server.
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