We are not blocking the public IP address you provided. Is it possible your system is behind a firewall that's interfering with your outbound traffic to the Let's Encrypt API?
You would need to proactively delete your post (this option is time-limited) or request that a forum moderator delete it. We will honor these requests, but we strongly discourage them. They make extra work for our (mostly volunteer) moderators and (mostly overburdened) staff; they reduce the amount of information that's available to help other community members in the future; and they do little or nothing for security, because it is trivially easy to index and discover the OS, Web server, and domain(s) that are running on any given IP address.