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Hi, I would suggest you to telnet to the ip address of your machine with port 3306 and see if your tcp session gets established on this session. You should use -d (debug) option with telnet to better see if tcp session is established.
So, telnet -d -p 3306 <ip address> should allow you to clear both routing and sec group issues.
See https://netbeez.net/blog/telnet-to-test-connectivity-to-tcp/ for more details about debugging tcp with telnet
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