SSL_connect returned=1 errno=0

[9mm]

I'm still getting this issue in 2025 and none of the prior solutions that people say work, work anymore...

    client = Postmark::ApiClient.new(ENV.fetch("POSTMARK_API_TOKEN"), {
      http_ssl_version: :TLSv1_2
    })

[codespore]

It is related to an issue reported in ruby/openssl#949. The solution is to simply add the following to your Gemfile:

gem "openssl", "~> 3.3.1"

You can remove more about it at https://www.rubyonmac.dev/certificate-verify-failed-unable-to-get-certificate-crl-openssl-ssl-sslerror