Based on error message it seems like, Breeze is sending data to MySQL but is not receiving any response back from it.
Can you please follow below for debugging this:
1. Make sure that MySQL server is reachable from Breeze.
2. With the JDBC URL mentioned in data source, please try connecting to MySQL server using a standalone program - I strongly suspect that MySQL is not responding back.
3. Make sure firewall on MySQL side allows the connection from external hosts, specifically from breeze eth0 IP.
4. Capture MySQL side server logs when connection is attempted by Breeze, we'd get to know why server is rejecting it.