MySQL ODBC Driver connection problem

Hi,
 
I have successfully setup unixODBC Manager and MySQL ODBC Drivers and
was able to connect to MySQL Server from my oracle database.
 
Now, today, when i am trying to connect to MySQL Server i am getting
following error:
 
SQL> select count("user_id") from "USER_SRCH_TBL"@mysqldb;
select count("user_id") from "USER_SRCH_TBL"@mysqldb
                                             *
ERROR at line 1:
ORA-28500: connection from ORACLE to a non-Oracle system returned this
message:
[Generic Connectivity Using ODBC][unixODBC][MySQL][ODBC 3.51
Driver]Can't
connect to MySQL server on 'devfwp2' (146) (SQL State: S1000; SQL Code:
2003)
ORA-02063: preceding 2 lines from MYSQLDB

 
This was working fine before. I havent changed anything on both the
side.
 
Please help me regarding this.
 
Thanks
 
Milan Thakkar