MySQL Connection to 12c Database (no replies)

Hi,
My team developer needs to use MySQL Workbench for this development work. We recently upgraded to 12c.
Am trying to test connection using MySQL Workbench to connect to 12c database. (Standalone).
I keep getting this error.

Could not connect, server may not be running.: Lost connection to MySQL server at 'waiting for initial communication packet', system error: 10060.

Your timely help will save my day. I thank you for taking time to read this. Thanks in advance.
Regards
Sharma