Re:

On Thu, 2018-05-24 at 10:58 +0200, Saurabh Lahoti wrote:

Below is our ldap module config:

That looks like a v2 ldap config. Are you still running v2? My guess from the little information provided is that you've upgraded to v3 and are trying to use your v2 config. Don't do that. Rebuild your config from scratch in v3. -- Matthew