When you try to add a user to a Policy Assignment Rule, ePO attempts to load the settings for a registered LDAP server. 

This issue is seen when adding a user for either of the following products:

• Data Loss Prevention (DLP)
• Drive Encryption (DE)

When the LDAP server that is first loaded can't be reached, you see the following error:

The registered LDAP server has either been removed or otherwise does not exist

You can't select any other registered LDAP servers from the list when using either:

• Google Chrome
• Microsoft Edge

The menu options are grayed out. Nothing happens when you try to select a different LDAP server.