I am having some issue authenticating via AD on an intermittent basis.  Many times it works perfect but often I receive the message "Login Failed, remember that Passwords are case sensitive" when in fact the username and password are both correct.  The event log displays the following errors:

AssemblyVersion: 04.08.04
PortalID: 0
PortalName:
UserID: -1
UserName:
ActiveTabID: 36
ActiveTabName: Home
RawURL: /Default.aspx?TabId=36&ctl=Login&returnurl=%2fDefault.aspx%3fTabId%3d36
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://owdint01/Default.aspx?TabId=36&ctl=Login&returnurl=%2fDefault.aspx%3fTabId%3d36
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 27ad36ae-2d77-47a0-90b4-eef2c8845885
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Authentication.ActiveDirectory.ADSI.ADSIProvider.GetUser
StackTrace:
Message: System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Authentication.ActiveDirectory.ADSI.ADSIProvider.GetUser(String LoggedOnUserName, String LoggedOnPassword)
Source:
Server Name: OWDINT01

AssemblyVersion: 04.08.04
PortalID: 0
PortalName:
UserID: -1
UserName:
ActiveTabID: 36
ActiveTabName: Home
RawURL: /Default.aspx?TabId=36&ctl=Login&returnurl=%2fDefault.aspx%3fTabId%3d36
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://owdint01/Default.aspx?TabId=36&ctl=Login&returnurl=%2fDefault.aspx%3fTabId%3d36
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: fe3d513d-1588-43b7-9d9a-2e90f54fceb8
InnerException: An operations error occurred.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.DirectoryServices.DirectoryEntry.Bind
StackTrace:
Message: System.Runtime.InteropServices.COMException (0x80072020): An operations error occurred. at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail) at System.DirectoryServices.DirectoryEntry.Bind() at System.DirectoryServices.DirectoryEntry.get_AdsObject() at System.DirectoryServices.PropertyValueCollection.PopulateList() at System.DirectoryServices.PropertyValueCollection..ctor(DirectoryEntry entry, String propertyName) at System.DirectoryServices.PropertyCollection.get_Item(String propertyName) at DotNetNuke.Authentication.ActiveDirectory.ADSI.Domain.PopulateInfo() at DotNetNuke.Authentication.ActiveDirectory.ADSI.Domain..ctor(String Path) at DotNetNuke.Authentication.ActiveDirectory.ADSI.Domain.GetDomain(String Path, String UserName, String Password, AuthenticationTypes AuthenticationType) at DotNetNuke.Authentication.ActiveDirectory.ADSI.Domain.PopulateChild(Domain Domain) at DotNetNuke.Authentication.ActiveDirectory.ADSI.Domain..ctor(String Path, String UserName, String Password, AuthenticationTypes AuthenticationType) at DotNetNuke.Authentication.ActiveDirectory.ADSI.Domain.GetDomain(String Path, String UserName, String Password, AuthenticationTypes AuthenticationType) at DotNetNuke.Authentication.ActiveDirectory.ADSI.Utilities.GetRootDomain()
Source:
Server Name: OWDINT01

Any help is appreciated.

Thanks.

Derek

I just did a quick google on the error (0x80072020). It looks like it might be a permission issue. Are you using impersonation in your web.config?

Impersonation is set to true in the web.config.

Derek