I checked my cloudwatch logs. Nothing relating to this problem was logged there. And as I stated in my previous post, on the instance where I've installed guacamole, I installed the mysql client and can connect to the database fine. I'm thinking it must have something to do with JDBC and AWS RDS, bc when I install mysql server on a physical instance, it doesn't have this issue. But I'm not pro enough with java to understand this JDBC failure.
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