KB Article | Forcepoint Support

Problem Description

Why am I seeing the following directory synchronization error?
 
"Directory Synchronization failed with error "LDAP connection failed [LDAP errno: -1 - Can't contact LDAP server]"
 

Resolution

Typically, this error is due to Directory Sync Client (DSC) failing to communicate with the configured Active Directory server. DSC should be able to connect across the network with your Active Directory servers, check connectivity.
  1. Launch Directory Sync Client.
  2. Select the Configuration.
Important Only one configuration should exist. If multiple configurations exist, select one to keep and delete the others.
  1. Confirm the Active Directory settings are correct. Select Groups > Modify > LDAP. If necessary, update the fields.
 User-added image
  1. Click Save.
  2. Click Next. This screen should not display an error.
  3. From the Summary pane, click Verify.
  4. Repeat these steps for data source entries on all tabs (Mail, Groups, Users).

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