How to Test LDAP ConnectionThere are several free utilities out on the Internet that can be used to test an LDAP connection. Microsoft also provides its own tools (for example LDP.exe or PortQryV2.exe) that can be used to test connection to AD.
Below is an example of the PortQry command line utility:
portqry -n myserver -p udp -e 389
For LDP.exe, you can refer to this article on Microsoft's Technet website.
You can also download some free tools like LDAP Browser that provides a GUI tool to test connectivity and view the AD.
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