I have been tring to set up an SSO and have hit this error wall. My code is below, any assistance would be greatly apprieciated.

Thanks

Exception Details: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.

Source Error:

Line 40: //Fixup the casing of the redirect URL to prevent problems with new cookies
Line 41: //being issued for a request with incorrect casing on the URL.
Line 42: redirectUrl = pages[redirectUrl];
Line 43: string baseServer = p.Request.Url.DnsSafeHost;

Source File: s:\BET_07_dev2\App_Code\Redirector.cs Line: 42

Stack Trace:

[KeyNotFoundException: The given key was not present in the dictionary.]
   System.ThrowHelper.ThrowKeyNotFoundException() +28
   System.Collections.Generic.Dictionary`2.get_Item(T Key key) +2635492
   Redirector.PerformCentralLogin(Page p) in s:\BET_07_dev2\App_Code\Redirector.cs:42
   login2.Page_Load(Object sender, EventArgs e) in s:\BET_07_dev2\login.aspx.cs:19
   System.Web.Util.CalliHelper.EventArgFunctionCaller (IntPtr fp, Object o, Object t, EventArgs e) +13
   System.Web.Util.CalliEventHandlerDelegateProxy.Cal lback(Object sender, EventArgs e) +45
   System.Web.UI.Control.OnLoad(EventArgs e) +80
   System.Web.UI.Control.LoadRecursive() +49
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3742
'''''''''''''''''''''''''''''''''''''''''''''''''' ''''''''''''''''''

MY CODE:
public static class Redirector
{
    private static Dictionary<string, string> pages;
    private static string centralLoginUrl;

    static Redirector()
    {
        centralLoginUrl = System.Configuration.ConfigurationManager.AppSetti ngs["centralLoginUrl"];

        //Register page mappings to force correct casing for the cookie
        //that will eventually be issued.
        pages = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase) ;

pages.Add("http://swann/central/login.aspx", "http://swann/central/login.aspx");

    }

    public static void PerformCentralLogin(Page p)
    {
        string redirectUrl = FormsAuthentication.GetRedirectUrl(string.Empty, false);
        //Fixup the casing of the redirect URL to prevent problems with new cookies
        //being issued for a request with incorrect casing on the URL.
        redirectUrl = pages[redirectUrl];
        string baseServer = p.Request.Url.DnsSafeHost;

        string customRedirectUrl = "http://swann/" + redirectUrl;

        p.Response.Redirect(centralLoginUrl + "?CustomReturnUrl=" +
                            p.Server.UrlEncode(customRedirectUrl) +
                            "&CustomCookiePath=" +
                            p.Server.UrlEncode(FormsAuthentication.FormsCookie Path));
    }
}

FYI - I fixed the error. I had to make two changes one in the way I was casing the items in the dictionary and two at the customRedirectUrl. i.e.
pages.Add("/bet_07_dev2/login.aspx", "/bet_07_dev2/login.aspx");
and
string customRedirectUrl = "http://serverName" + redirectUrl;