Custom socket factory is not getting called on Linux - works on Windows and Mac

Question

Refer to the code below. It works fine on Windows and Mac but not on Linux. It does not call the MySSLSocketFactory class and as a result, the cert is not trusted. Any suggestions???

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;

public class LdapBaseDN {
    public static void main(String[] args) {
        Hashtable<String, String> env = new Hashtable<String, String>();

        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.SECURITY_AUTHENTICATION, "none");
        env.put(Context.PROVIDER_URL, "ldaps://MyServerIP:636");
        env.put(Context.SECURITY_PROTOCOL, "ssl");
        env.put(Context.REFERRAL, "follow");
        env.put("java.naming.ldap.factory.socket", MySSLSocketFactory.class.getName()); //MySSLSocketFactory does not get called on Linux
        try {
            DirContext ldapContext = new InitialDirContext(env);
            System.out.println("Connected successfully ");

        } catch (Exception e) {
            e.printStackTrace(); //SSLHandshake fails because Cert is not trusted on Linux
        }
    }
}