Re: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Posted by: Todd Farmer
Date: August 19, 2014 06:05PM

Hi Rashad,

This looks like the root cause:

Caused by: java.net.ConnectException: Connection refused

That's telling you that port 3306 of sql-4.radyx.ru cannot be accessed. Check for any firewalls that might be active and blocking access. You should be able to check using telnet from the client host:

shell> telnet sql-4.radyx.ru 3306

If it's accessible, MySQL server will spit out a handshake (includes the server version string in plain-text, so it's easy to recognize).

Hope that helps,

--
Todd Farmer
MySQL @ Oracle
http://www.oracle.com/mysql/

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