In the Localhost logs, you find the following error (Note: This is a Microsoft error being returned in Localhost logs):
org.springframework.ldap.UncategorizedLdapException: Uncategorized exception occured during LDAP processing; nested exception is javax.naming.NamingException: [LDAP: error code 80 - 00000008: SysErr: DSID-0205160D, problem 12 (Not enough space), data 0
This is due to memory issue on the remote LDAP server.
The LDAP server is running out of memory trying to query and send 1 or more LDAP requests. The memory needs increased or the underlying memory issue resolved on the remote LDAP server.