Cannot establish db connection: "Connection refused"

[_AnonymousUser]

Hello,
I'm trying to establish a connection to a mysql5 database (Metadata, right click on a db), but i always get a 
"The driver has not received any packets from the server." ... "Connection refused".
My connection string is the following: jdbc:mysql://localhost:3306/mydb?noDatetimeStringSync=true (I'm using localhost as the server on my local machine, looks like it's not going to work..).
Do you have any suggestion ..? Thanks

[Anonymous]

Hi All,
Can any1 solve my query.
i want to read 80 million record from mysql and write into mysql.
But after 20 million reads it gave me could not create connection error.
.
.
2016-06-10 03:07:25;aAtDjY;kC202j;kC202j;BIOWISE_ETL_JOB;BW_Dbnsfp_SNP_Job_0;Default;6;Java Exception;tMysqlInput_1;com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:Could not create connection to database server. Attempted reconnect 3 times. Giving up.;1
can any1 ll provide solution for this?
Regards,
Anand Yadav