更新後、メール通知が機能しない

最新版にアップデートしたところ、突然メール通知が機能しなくなりました。

Sidekiq で以下のエラーが発生しています:

obs::HandledExceptionWrapper: Wrapped OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=error: dh key too small

しかし、これについて役立つ情報をほとんど見つけることができません。

私の設定は基本的なものです:

DISCOURSE_SMTP_ADDRESS: <smtp.domain.com>
DISCOURSE_SMTP_PORT: 587
DISCOURSE_SMTP_USER_NAME: <account@domain.com> 
DISCOURSE_SMTP_PASSWORD: '<password>'
DISCOURSE_SMTP_ENABLE_START_TLS: true           # (オプション、デフォルトは true)

(プライバシー保護のため URL は伏せていますが、すべて標準的な設定です)

「いいね!」 1

There is a problem with your https certificates.

I guess my questions are…

A) Why is this problem something that didn’t exist before but does now, and how do i find out what that problem is. and

b) Why does that problem only affect smtp and not the site as a whole? My SSL certificates are valid until april 2020, and https is working fine on the site as a whole…

Is there any method to troubleshoot why discourse suddenly doesn’t like my ssl certificates for smtp?

The problem is this:

The SMTP you are using provides a DH key that is too small. Are you using your own SMTP server? If so, you are in good company. Rackspace had the same problem up until recently.

Email SSL Errors after Update to 2.4.0.beta4 - #11 by gerhard contains instructions on how to debug the issue and a temporary workaround. But you or your provider should really increase the size of the DH key.

「いいね!」 1