The test connection for LDAP is not working in the Operations Console. There is no problem in network connectivity on either LDAP port 389 or LDAPS port 636. The issue is resolved if you change the protocol from LDAP to LDAPS.
When testing, the following error displays:
There was a problem processing your request. Test connection failed. One or more directory connections is incorrect.
Testing from an SSH session with open_ssl s_client is successful: