Cristian Livadaru's Blog

Ok, this was a huge waste of time going down this rabbit hole. Postfix complains about handshake failure when trying to send emails over TLS. Non TLS works fine, receiving mails via TLS works fine, what gives?

Using INWX as a DNS provider for the DNS challenge with nginx-proxy-manager and Let’s Encrypt wildcard SSL certificates is easy, but what the hell is that shared secret?

Generating wildcard SSL certificates with Let’s Encrypt and DNS challenge is a bit tricky with ISPConfig. It could be very straight forward but there is a little bug in the ISPConfig API or the nginx-proxy-manager that calls the API. Here is how you can work around it.