F5 Waf AD integration issue.

Hi all, 
I hope this message finds you well. I'm writing to bring to your attention an issue we are experiencing with access to our F5 devices. We have a total of four F5 devices, all of which are Active Directory integrated. Here's a breakdown of the current situation:
1.      Port 389 (LDAP):
o       Three out of the four devices are accessible on port 389 without any issues.
2.      Port 636 (LDAPS):
o       None of the devices are accessible on port 636 (LDAPS).
o       This includes three of the devices that areaccessible on port 389.
3.      DMZ Device:
o       One device, which is located in the DMZ, is inaccessible on both ports 389 and 636