ASP.NET Active Directory Authentication

First attempt to authenticate a website with AD. The web server is not a member of the domain.  I am using the example from this page  LDAP is not my strong point but I think it have it correct (not sure how to test).  When I run the site I get an error at this position:

type="System.Web.Security.ActiveDirectoryMembershipProvider, System.Web, Version=,Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

error is Serverless LDAP connection strings are not supported by the Active Directory membership provider.

I have this in my webconfig:
            <add name="ADConnectionString" connectionString="LDAP://CN=Administrator,CN=Users,DC=domainname-here,DC=local"/>

<membership defaultProvider="DomainLoginMembershipProvider">
        <add name="DomainLoginMembershipProvider"
             type="System.Web.Security.ActiveDirectoryMembershipProvider, System.Web, Version=,Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

I have tried domain\Administrator for connectionUsername with no success.
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What happens if you use this connection string: dap://server-name/dc=domainname-here,dc=local

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azyet24Author Commented:
I used your suggestion and now I get this error:
Unable to establish secure connection with the server

I moved the application to a computer on the domain and am able to login successfully.  Would this be a port issue or something that would be preventing my web server (inside DMZ) or is there another setting?  If port, do you know how I would allow authentication securely?
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Ok, so what you are saying is that your code works on a computer that is in the domain but not on a computer outside the domain. Correct?

What I would do in this situation is take a step back and debug the way to read from LDAP just in my own C# code using the computer that is not on the domain.  Then once I got that working, I would try to apply the results of that to your authentication problem.  That might seem like the long way around to you but that is the approach that I would use if I were having the same problem.  Are you interested in doing that?  

Also, what happens if you use the connection string “ldap://¿, where you substitute the address of the domain controller?
azyet24Author Commented:
Hmm, changed to IP address and now I get Access is denied from my web server.  Does that mean that my application is actually talking to my Active Directory?
Yes, I think so. If you use a workstation that is inside the domain, does the web server still give you access denied?
azyet24Author Commented:
Turns out that I had a DNS issue so changing to IP address fixed that part and I simply needed to change Administrator to domain\Administrator and now it is working perfectly!!!  Thank you so much for your help.

I changed it to use code-behind authentication instead of web config so I could see what it was doing - per your suggestion.
Excellent - thanks for letting me know!
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