Are thee any tools out there that can tell you what your LDAP connection string is?
Are you looking for examples of how to set one up?
http://www.connectionstrings.com/ should help if that's the case.
Do you mean what is the name of the LDAP servers for your active directory domain? Then you want to use SRV records. Assuming your active directory base domain is foo.com you want to look up the SRV record of _ldap_tcp.foo.com see this technet article
There's a tool called Softerra ldap browser that I used when I was first messing around with ldap on windows.
It connected something like this ldap://domaincontrollername:port/ and used my network credentials.
I also have done a little in .net with it and have had similar strings to connect and also using ldap://DC=domainname and if your domain name is something like here.there then ldap://dc=here,dc=there
I ran the following VBScript on the Server.
Set objSysInfo = CreateObject("ADSystemInfo")
objSysInfo.RefreshSchemaCache
WScript.Echo "User name: " & objSysInfo.UserName
Copy all of the DCs displayed in the dialog box and use that as your LDAP connection string following LDAP://