How do you figure out the LDAP://? ("Error authenticating. Error authenticating user. The specified domain either does not exist or could not be contacted")

That function is probably failing because the SearchRoot used by the
DirectorySearcher needs to be built with a specific server name and login
credentials, much like the bind operation you did to authenticate the user
in the first place.

If you replace the line:

Dim search As DirectorySearcher = New DirectorySearcher(_path)

with:
Dim search As DirectorySearcher = New DirectorySearcher(rootEntry)

Where rootEntry is a DirectoryEntry object built the same way you built the
entry to get the authentication to work, then you should be fine.

That said, in my opinion this example from Microsoft is very flawed and
probably should not be used. Using memberOf does not give you nested group
membership, does not ensure that the groups are security groups and does not
include the user's primary group. A much better solution is to use the
tokenGroups attribute on the current user to get their full transitive
security group membership. The trick is that this attribute returns an
array of SID structures as byte(), so they are a bit harder to resolve back
into names (but certainly not impossible).

Normally, you are interested in the group names if you want to build an
IPrincipal object in order to make role-based authorization decisions. If a
simple authentication (in or out of the site) is adequate for your needs,
then you could easily just skip this whole mess and be done with it.
Normally, you need role-based authorization if certain users are allowed to
perform certain actions that others are not and you need an easy way to
distinguish them at runtime.

I hope that helps,

Joe K.

"mrwoopey" <mrwoopey@yahoo.com> wrote in message
news:e48ab325.0306251041.392308b9@posting.google.c om...

> Hi Marc,
>
> Thanks for the tip, it worked! The thing that doesn't work now is
> trying to find the group that the user is in ("Error obtaining group
> names"). So, I commented out the code "adAuth.GetGroups()". Does
> anybody know how to get "adAuth.GetGroups()" working from the example:
>
> http://support.microsoft.com/default...B;EN-US;326340
>
> Besides that I can log in. Do I really need to check for group name?
>
> Thanks,
>
> Phin
>
> "Marc Nivens [MSFT]" <marcn@online.microsoft.com> wrote in message

news:<O3NbmutODHA.3408@tk2msftngp13.phx.gbl>...

> > DC= should be followed by a domain DN, not a servername. If you want to
> > bind to DC1 in domain domain.com, you would use this:
> >
> > LDAP://DC1/DC=domain,DC=com
> >
> > If you use serverless binding, you would just use:
> >
> > LDAP://DC=domain,DC=com
> >
> > --
> > Marc Nivens
> > Enterprise Messaging Support
> >
> > This posting is provided "AS IS" with no warranties, and confers no

rights.

> > Use of included script samples are subject to the terms specified at
> > http://www.microsoft.com/info/cpyright.htm
> >
> >
> > "mrwoopey" <mrwoopey@yahoo.com> wrote in message
> > news:e48ab325.0306241458.78b2dbda@posting.google.c om...

> > > Hi,
> > >
> > > I am using the example "Authenticate against the Active Directory by
> > > Using Forms Authentication and Visual Basic .NET":
> > >
> > > http://support.microsoft.com/default...B;EN-US;326340
> > >
> > > But I am having a problem figuring out the LDAP://
> > >
> > > The LDAP:// that I pass looks like this (i substitued generic the
> > > following with generic name):
> > >
> > > Dim adPath as String =
> > > LDAP://DC=SomeDomainControllerComputerThatHasActiveDirect ory"
> > >
> > > But I am receiveing the following message when I try to log in with
> > > the example:
> > > "Error authenticating. Error authenticating user. The specified domain
> > > either does not exist or could not be contacted"
> > >
> > > How do I figure out how my "LDAP://" should look like?
> > >
> > > Thanks,
> > >
> > > Phin

Joe,

Thanks for your input. I'll try it!

thanks,

Phin

Joe,

Thanks for your input. I'll try it!

thanks,

Phin