Dblink from Oracle to Mysql error PLZ HELP!!!

Question

Hi All,
I am getting the following error when i am creating a databaselink to connect from oracle 10g to mysql 5.1.
SQL> select * from ahmed_table@ahmedmysql3;
select * from ahmed_table@ahmedmysql3
ERROR at line 1:
ORA-28545: error diagnosed by Net8 when connecting to an agent
Unable to retrieve text of NETWORK/NCR message 65535
ORA-02063: preceding 2 lines from AHMEDMYSQL3My ODBC database source name is ahmedmysql
created file initahmedmysql.ora in hs/admin contents of which are
HS_FDS_CONNECT_INFO = ahmedmysql
HS_FDS_TRACE_LEVEL = offListener.ora contents
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = orcl)
      (ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
hmedmysql =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = rc-6799)(PORT = 1521))
(SID_NAME = ahmedmysql)
      (ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
      (PROGRAM = hsodbc)
  )Tnsnames.ora
ahmedmysql = (DESCRIPTION = (ADDRESS = (PROTOCOL = tcp)(HOST = RC-6799)(PORT = 1521)) (CONNECT_DATA = (SID = ahmedmysql)) (HS = OK))I have searched on this site no one seems to have had found a solution!
Is this a bug or am i missing something in the configuration,
appreciate your help,
regards,

Answer 1

28545, 0000, "error diagnosed by Net8 when connecting to an agent"
// *Cause:   An attempt to call an external procedure or to issue SQL
//           to a non-Oracle system on a Heterogeneous Services database link
//           failed at connection initialization.  The error diagnosed
//           by Net8 NCR software is reported separately.
// *Action:  Refer to the Net8 NCRO error message.  If this isn't clear,
//           check connection administrative setup in tnsnames.ora
//           and listener.ora for the service associated with the
//           Heterogeneous Services database link being used, or with
//           'extproc_connection_data' for an external procedure call.