Forms Authentication with Active Directory, login control crashes

Hi,

I'm developing an ASP.net 2.0 application that use Forms Authentication. I’m
using the login control that came with V.S. 2005. I configured my web.config
to use Active Directory Membership/Authentication. Everything works fine. I
can login using the correct username and password, and if you login with
incorrect user name, it displays a message saying "Your login attempt was not
successful. Please try again" which is expected.
But the problem is, if I login with correct username but incorrect password,
the application throws an exception (please see the server error message
below). I can't find the solution to fix this problem, or at least be able to
catch the exception so that I can display a friendly and helpful message to
the user. I have tried everything, spent long nights finding the answer but
can't seem to make this work. Any ideas or thoughts would be much appreciated
Thanks in advance.
Edwin Tierra
This is the content of web.config that is related to security/login:
<connectionStrings>
<add name="ADConnectionString"
connectionString=LDAP://ads-server.mydomain.net/DC=mydomain,DC=net />
<add name="MyASPNETDBConnectionString" connectionString="Data
Source=myDBServer;Initial Catalog=ASPNETDB;Integrated Security=True"
providerName="System.Data.SqlClient"/>
</connectionStrings>
<authorization>
<allow roles="sysadmin" />
<allow roles="projadmin" />
<allow roles="managers" />
<deny users="?" />
</authorization>
<authentication mode="Forms">
<forms name=".ADAuthCookie" defaultUrl="default.aspx" timeout="30"
domain="" />
</authentication>
<roleManager enabled="true" defaultProvider="CustomizedRoleProvider"
cookieTimeout="30" cookieSlidingExpiration="true">
<providers>
<add connectionStringName="MyASPNETDBConnectionString"
name="CustomizedRoleProvider"
type="System.Web.Security.SqlRoleProvider"
applicationName="/PMS.Net"/>
</providers>
</roleManager>
<membership defaultProvider="MyADMembershipProvider">
<providers>
<add connectionStringName="ADConnectionString"
applicationName="/PMS.Net"
connectionUsername="mydomain\administrator"
connectionPassword="password"
attributeMapUsername="sAMAccountName"
enableSearchMethods="true"
name="MyADMembershipProvider"
type="System.Web.Security.ActiveDirectoryMembershipProvider, System.Web,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</providers>
</membership>


This is the error message that I get when the application crashes:
Server Error in '/' Application.

A local error occurred.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information about
the error and where it originated in the code.

Exception Details: System.DirectoryServices.Protocols.LdapException: A local
error occurred.

Source Error:

An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:

[LdapException: A local error occurred.]
System.DirectoryServices.Protocols.LdapConnection.BindHelper(NetworkCredential
newCredential, Boolean needSetCredential) +990
System.DirectoryServices.Protocols.LdapConnection.Bind(NetworkCredential
newCredential) +6
System.Web.Security.ActiveDirectoryMembershipProvider.ValidateCredentials(String
username, String password) +221
System.Web.Security.ActiveDirectoryMembershipProvider.ValidateUserCore(String
username, String password) +1180
System.Web.Security.ActiveDirectoryMembershipProvider.ValidateUser(String
username, String password) +15
System.Web.UI.WebControls.Login.OnAuthenticate(AuthenticateEventArgs e) +160
System.Web.UI.WebControls.Login.AttemptLogin() +105
System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e) +99
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35
System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +115
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
+163
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String
eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl,
String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) +5102


Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET
Version:2.0.50727.42

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