Creating user in Active directory with c# - problem with property Allow access in Dial-in

Posted on 2008-06-25
Last Modified: 2013-12-16

I have to code a .dll in c# that will create/manage user in our active directory.
Everything works great, except one thing. Im not able select "Allow access" in Dial-in tab.
I try this line "newUser.Properties["msNPAllowDialin"].Add(true);". No error there with compilation or execution. But i see no change in AD.

Later if I search for this user throught c# code, i see that property msNPAllowdialin = true.

Am I missing something in my code? Or this problem is related to our AD ?

Thanks in advance for your help !
public void selectDomain(string ldapPath) {
            currentDomainDE = new DirectoryEntry(ldapPath);
            currentDomainDE.AuthenticationType = AuthenticationTypes.Secure;
        public void CreateUserAccount(string _userName, string _userPassword, string _firstName, string _lastName,
                                      string _description, string _company)
                DirectoryEntry newUser = currentDomainDE.Children.Add("CN=" + _userName, "user");
                newUser.Properties["samAccountName"].Value = _userName;
                newUser.Properties["displayname"].Add(_firstName + " " + _lastName);
                int flags = (int)newUser.Properties["userAccountControl"].Value;
                newUser.Properties["userAccountControl"].Value = (flags ^ 0x10000);
                this.changePasswordUser(newUser, _userPassword);
            catch { .......}

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Question by:zeppyboy
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LVL 71

Expert Comment

by:Chris Dent
ID: 21874210

AD related I believe.

It depends a little, tell us about your domain if you could? Specifically, what Functional Level is your domain set to?

Mine works when set using a small script with Functional Level set to Windows 2003 Native.

And take a look at these two articles:;en-us;252398;en-us;257341



Author Comment

ID: 21878741
Thanks Chris,

As soon as my network administrator is back from vacancy (monday), i will ask him what Functional Level is our domain, then i will come back.
LVL 71

Expert Comment

by:Chris Dent
ID: 21879014

Good stuff. Hopefully that's all it is :)

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Author Comment

ID: 21883075
I find the information.

Current domain functional level :
Windows 2000 mixed
LVL 71

Accepted Solution

Chris Dent earned 130 total points
ID: 21883112

There we go :)

You must switch to Native for the change to work as you expect in your existing code.

For whatever reason the attribute cannot be updated correctly using ADSI / DirectoryServices via LDAP in Mixed Mode.

Alternatively bind using the WinNT interface as described in:;en-us;252398

However, there are no issues with changing to Native Mode unless you have Windows NT 4 Backup Domain Controllers on the Domain.


Author Comment

ID: 21883240
I will be surprise if we have a NT4 DC. So i will ask him if we can go with Native Mode.

If not, i will try the other option with the .dll and winnt provider.
Do you know where i can find the ADSI SDK on MS website? All the links I try redirect to

Thanks for your help !
LVL 71

Expert Comment

by:Chris Dent
ID: 21883493

Hmm that's a good question.

You don't seem to be able to get it any more. I know they stopped doing any work on it quite a few years ago, but that doesn't help if they're still got references to it.

You can grab the file from here though:

Obviously we can't vouch for the validity of the files held on the site, so use them with care.


Author Comment

ID: 21947585
For your information, with the modification of our domain from Windows 2000 Mixed to Windows 2000 Native, everything works great now. Thanks for your help !

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