Just to be clear, we don't have any problem right now, but we are worried to upgrade and not be able to use the ldaps again.
After your message, I changed our DNS server to use our internal and after changed our ip of our LDAPS server to the fqdn. I was able to activate the server identity check and everything seems good.
My question it more about, if I upgrade to the last firmware, do you think it will broke our ldaps connectivity?
Thanks for your help!