Haproxy causes "Communications link failure" with JDBC and MySQL

@andrea wrote:

I'm running a dockerized metabase instance on rancher server and I'm using haproxy to front the application. Everything runs pretty fine if not that upon first page hit I get the following error page:

HTTP ERROR: 500
Problem accessing /. Reason:
    Communications link failure
The last packet successfully received from the server was 1,758,522 milliseconds ago.  The last packet sent successfully to the server was 2 milliseconds ago.

The fun thing is that a refresh fixes the issue, which comes back after a period of inactivity.
Any suggestion please?

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