Connect to Active Directory using LdapConnection class on remote server

Question

I have a problem: I need to connect from a remote server to Active Directory, but the code has to be using the LdapConnection class. I need this because that way I can only test change notifiers when some event happen (such as user is deactivated or he changed group, data etc). OS on the remote server is Windows Server 2012.

I managed to do this from local using DirectoryServices with the following code:

String ldapPath = "LDAP://XRMSERVER02.a24xrmdomain.info";
directoryEntry = new DirectoryEntry(ldapPath, @"A24XRMDOMAIN\username", "pass");

//// Search AD to see if the user already exists.
DirectorySearcher search = new DirectorySearcher(directoryEntry);
search.Filter = "(&(objectClass=user))";
SearchResult result = search.FindOne();

This is okay and connection works but now I need to connect using the LdapConnection class.

I tried something like this on many ways but none of that helped me:

LdapConnection connection = new LdapConnection(XRMSERVER02.a24xrmdomain.info);
var credentials = new NetworkCredential(@"A24XRMDOMAIN\username", "pass");             
connection.Credential = credentials;
connection.Bind();

It says that credentials are invalid but that is not true.

Explanations:

• XRMSERVER02 - Domain controller
• a24xrmdomain.info - Domain
• A24XRMDOMAIN - Domain used for logging

Thanks for your help.

Answer 1

Try using NetworkCredential constructor with 3 parameters: username, password and domain. Specify domain separately from user name

Answer 2

Even though I solved my problem I want to share with other developers what I achieved so far. Problem that I encountered was that I had remote server with OS Windows server 2012 and Active directory on it. I needed to connect on him via my local machine( Windows 10 ). As I stated in my question it is possible to do that via DirectoryServices with the following code:

String ldapPath = "LDAP://(DomainController).a24xrmdomain.info";
directoryEntry = new DirectoryEntry(ldapPath, @"DOMAIN\username","pass");

//// Test search on AD to see if connection works.
DirectorySearcher search = new DirectorySearcher(directoryEntry);
search.Filter = "(&(objectClass=user))";
SearchResult result = search.FindOne();

This is one of the solutions, but since my task was to get notification and to identify when ever some object has changed in Active Directory, I needed connection to Active Directory on Remote server via LDAP class. Code for getting notifiers is taken from:
- Registering change notification with Active Directory using C#

I succeeded to connect with LDAP class via next code:

String ldapPath2 = "(DomainController).a24xrmdomain.info";
LdapConnection connection = new LdapConnection(ldapPath2);
var credentials = new NetworkCredential(@"username", "pass");             
connection.Credential = credentials;
connection.Bind();

Want to mention that no IP address of remote server is needed, just Domain Controller that is used on him, and that Domain used for logging is unnecessary.

Happy coding