Samba: wbinfo -u or wbinfo -g not displaying any output.

Issue

• wbinfo -u or wbinfo -g not displaying any output.
• Error observed in samba logs.

2016/05/27 10:08:53.558326,  1, pid=1247, effective(0, 0), real(0, 0)] ../librpc/ndr/ndr.c:439(ndr_print_function_debug)
       wbint_QueryUserList: struct wbint_QueryUserList
          out: struct wbint_QueryUserList
              users                    : *
                  users: struct wbint_userinfos
                      num_userinfos            : 0x00000000 (0)
                      userinfos: ARRAY(0)
              result                   : NT_STATUS_IO_TIMEOUT
[2016/05/27 10:08:53.558426, 10, pid=1247, effective(0, 0), real(0, 0), class=winbind] ../source3/winbindd/winbindd_list_users.c:128(winbindd_list_users_done)
  Domain EXAMPLE returned 0 users
[2016/05/27 10:08:53.558459, 10, pid=1247, effective(0, 0), real(0, 0), class=winbind] ../source3/winbindd/winbindd_list_users.c:134(winbindd_list_users_done)
  List_users for domain EXAMPLE failed
[2016/05/27 10:08:53.558482, 10, pid=1247, effective(0, 0), real(0, 0), class=winbind] ../source3/winbindd/winbindd.c:787(wb_request_done)
  wb_request_done[1461:LIST_USERS]: NT_STATUS_OK
[2016/05/27 10:08:53.558537, 10, pid=1247, effective(0, 0), real(0, 0), class=winbind] ../source3/winbindd/winbindd.c:851(winbind_client_response_written)
  winbind_client_response_written[1461:LIST_USERS]: delivered response to client
[2016/05/27 10:08:53.558703,  6, pid=1247, effective(0, 0), real(0, 0), class=winbind] ../source3/winbindd/winbindd.c:957(winbind_client_request_read)
  closing socket 28, client exited