AD LDAPS with Encryption Enabled Fails Test Connection

Description

I have a new setup of RC and am working on integrated LDAP sync with Active Directory.
If I leave the settings at the default 389, Test Connection is successful.
If I change the port to 636, the Test Connection is successful.
If I change the port to 636 and enable Encryption to either StartTLS or SSL/LDAPS, the Test Connection fails.

I ran LDP.exe on the AD server and verified 636 is listening with a 256 cipher.

Server Setup Information

  • Version of Rocket.Chat Server: 4.6.2
  • Operating System: Ubuntu 18.04
  • Deployment Method: snap
  • Number of Running Instances: 1