Users cant sign in when LDAP server is down

When LDAP server is down/offline users can't sign in to the server. This is after the "REBUILD DIRECTORY SERVER CACHE" button has been clicked (while server was online and users could log in) and i waited 15 minuttes to be sure that the task was completed.

I have not waited for the crownjob to be completed, only started it manually.

I've set the impact for medium as this will only affect people using LDAP and where the LDAP server falls down and users attempt to log in.