From a windows command line or run dialog.Run %SystemRoot%\SYSTEM32\rundll32.exe dsquery,OpenQueryWindow.In the Find drop down select Custom Search.Then switch to the Advanced tab.Here you can test your query.

How do I test a LDAP query?

Click System > System Security. Click Test LDAP Authentication Settings. Test the external (LDAP) user name search filter. In the LDAP user name field, type the name of an existing external user, for example user1 , and click Test LDAP query.

How do I test my LDAP connection?

If you want to try ldap and ldaps connection you can go on your dc or any other windows server and use the LDP.exe to check. It is located in C:\Windows\SYSTEM32\ folder. After finishing you can be sure your DCs accept LDAPS and are logging LDAP connections.