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You can instruct npgsql to ignore this by specifying trust server. If you don't set ssl=true and also don't set sslmode, then jdbc behaves as if. Certificate verify failed. i recommend checking whether your root certificate.
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Based on your description, it seems you're encountering an error message that states ssl error: I have edited the pg_hba.conf file to force ssl using hostssl only. Choose full mode when your origin can support an ssl certification, but — for various reasons — it cannot support a valid, publicly trusted certificate.
The ssl connection will fail if the server certificate cannot be.
By default, npgsql will validate your server's certificate;
