SYMPTOM:
When user uses ".cer" as suffix of server certificate file in Strategy 10.x, error appears as showed below.
An error occurred during authentication. Please contact your administrator: LDAP Server error (-1): Can't contact LDAP server.
CAUSE:It is expected behavior.
ACTION:Use ".pem" as suffix of server certificate and follow the technical below to configure LDAP connectivity using SSL.
KB12067: How to configure LDAP connectivity using Clear text (using OpenLDAP) or SSL (using OpenSSL) for MicroStrategy Intelligence Server 9.x on Linux.