oracle连接sqlserver的问题

dblink已经建立好了在查询sqlserver中的表时报下面的错，tnsping ora2sql  可以ping的通
ora-03001： unimplemented feature
ora-02063： preceding line from ora2sqltns文件如下
ora2sql =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 172.16.3.92)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = ora2sql)
      (HS = OK)
    )
    (HS = OK)
  )