If you are trying to set up an LDAP connection and are not sure if it’s the application that is failing or if it’s your domain controller. Here is a quick test that you can run to see if the LDAP connection is working properly. JExplorer requires Java in order to work, here are the download links.
Here is a quick example how to connect to your domain controller with LDAP
Ports used by ldap:
ldap://dc.mylab.local:389 <–Searches Domain
ldap://dc.mylab.local:3268 <–Searches Global Catalog Server
Check your Policies
If you can’t connect with ldp.exe by using regular ldap you might have a policy set on your Domain Controller to specifically use LDAPS only. Double check the below and these options should allow you to use regular ldap.
Local Security Policy
Security Settings > Local Policies > Security Options > Domain Controller: LDAP server signing requirements set to none
Group Policy Management Editor
Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options > Domain controller: LDAP server signing requirements set to Not Defined.