Can't connect to MySQL database (on AWS) from

Hi all, my app connects to the MySQL instance on AWS from my computer, but when I deploy to, the app runs OK, but when it attempts to connect, it hangs or crashes and the Log file reports.

2020-05-26T07:23:01.032414+00:00 shinyapps[2356724]: Warning: Error in : Failed to connect: Can't connect to MySQL server on 'I ...' (110)

Could it be similar to these symptoms?

And getting the same error if trying connect to a MariaDB instance on AWS. Has anyone got any ideas what is happening?

Finally worked it out. Did not realise I had to whitelist the IP addresses for shiny found here

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