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If you've turned on Log Exports (under Advanced Configuration) in RDS, you might be able to find some hints in CloudWatch. You can also walk through these troubleshooting steps.
answered 2 years ago
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I am having the same issue but it happens sporadically. Out of a 100,000 connection it may happen once or twice. It more when under load. I’ve looked at the logs and don’tsee anything obvious.
We having it happening on 2 different applications running on different OS and using 2 different database connectors so we seriously doubt it’s our code.
It doesn’t seem to be an dns issue either as we have programmatically ever 3 seconds checked for 28 hours successfully and during that time has the sporadic unable to connect issue occur in our different applications.
Have you found a solution on this yet?