you can test from another windows server via lpd.exe if ad-controller is accepting ldaps-connections
from vcsa-console its possible with ldapsearch - see manpage for options
Thanks for the information.
Small correction it is ldp.exe not lpd.exe
The tool can connect to the AD servers from a Windows server on port 636, but that doesn't mean I can access them from vCenter on port 636.
Is there any way to test this via the remote console?
yes - i wrote that ldp.exe can test from windows.
but i also wrote that ldapsearch can test from the vcsa - just ssh into the vcsa and test
If the only thing you want to test is port connectivity.
From VCSA you can login into SSH or using Shell and use curl -v telnet://DomainControllerIP:636
There you will confirm if it is reachable.
Super that's it.