Unable to Find/Add contact with normal user, only admin can

Hi,

First of thanks thanks for this great software and for your support

I'm using ejabberd for my private jabber server

My configuration is very simple, I have less than 10 users and 1 admin

My users use Miranda as client,
when they use the Find/Add Contacts feature they are unable to find each other

If I use the same feature with my account
I'm able to see them from the Find/Add Contacts window

This is my conf (without comments):

{acl, admin, {user, "admin"}}.
{hosts, ["jabber.mydomain.net"]}.
{acl, local, {user_regexp, ""}}.
{access, pubsub_createnode, [{allow, all}]}.
{access, configure, [{allow, admin}]}.
{access, register, [{deny, all}]}.
{welcome_message,
 {"Welcome!",
  "Welcome to Debian Jabber Service.  "
  "For information about Jabber visit http://jabber.org"}}.
{access, announce, [{allow, admin}]}.
{access, c2s, [{deny, blocked},
               {allow, all}]}.
{shaper, normal, {maxrate, 1000}}.
{shaper, fast, {maxrate, 50000}}.
{access, c2s_shaper, [{none, admin},
                      {normal, all}]}.
{access, s2s_shaper, [{fast, all}]}.
{access, muc_admin, [{allow, admin}]}.
{access, muc, [{allow, all}]}.
{access, local, [{allow, local}]}.
{auth_method, internal}.
{max_user_sessions, 10}.
{language, "en"}.
{listen,
 [{15222, ejabberd_c2s,     [{access, c2s},
                            {max_stanza_size, 65536},
                            starttls, {certfile, "/etc/ejabberd/ejabberd.pem"},
                            {shaper, c2s_shaper}]},
  {5223, ejabberd_c2s,     [{access, c2s},
                            {max_stanza_size, 65536},
                            tls, {certfile, "/etc/ejabberd/ejabberd.pem"},
                            {shaper, c2s_shaper}]},
  {5269, ejabberd_s2s_in,  [{shaper, s2s_shaper},
                            {max_stanza_size, 131072}]},
  {15280, ejabberd_http,    [http_poll, web_admin]}
 ]}.
{s2s_use_starttls, true}.
{s2s_certfile, "/etc/ejabberd/ejabberd.pem"}.
{outgoing_s2s_port, 5269}.
{modules,
 [
  {mod_adhoc,      []},
  {mod_announce,   [{access, announce}]}, % Depends on mod_adhoc
  {mod_register,   [{access, register}]},
  {mod_roster,     []},
  {mod_privacy,    []},
  {mod_configure,  []}, % Depends on mod_adhoc
  {mod_configure2, []},
  {mod_disco,      [{extra_domains, ["users.jabber.org"]}]},
  {mod_stats,      []},
  {mod_vcard,      []},
  {mod_offline,    []},
  {mod_echo,       []},
  {mod_private,    []},
  {mod_irc,        []},
  {mod_muc,        [{access, muc},
                    {access_create, muc},
                    {access_admin, muc_admin}]},
  {mod_shared_roster, []},
  {mod_pubsub,     [{access_createnode, pubsub_createnode}]},
  {mod_time,       []},
  {mod_last,       []},
  {mod_version,    []}
 ]}.

Any hint? Thanks