pgadmin says "SSL error: tlsv1 alert no application protocol"

From: Markus KARG <markus(at)headcrashing(dot)eu>
To: pgsql-advocacy(at)lists(dot)postgresql(dot)org
Subject: pgadmin says "SSL error: tlsv1 alert no application protocol"
Date: 2024-12-12 19:08:20
Message-ID: 44f71a8f-c6b4-4218-bb77-3e0a3a60c44d@headcrashing.eu
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I was using PGAdmin with PostgreSQL 17 via Traefik 3 successfully since
many months, but since I recently moved on to PostgresSQL 17 the UI of
PGAdmin always tells me "SSL error: tlsv1 alert no application
protocol". All other applications connect successfully.

I do not want to use TLSv1, and neither PostgreSQL 17 nor Traefik 3 is
explicitly configured to use TLS v1. In PGAdmin I explicitly have set
the min and max SSL versions to 1.3.

So I do wonder who in this game is using TLSv1 and how to get rid of it?

Thanks!

-Markus

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