jrollans.com is a Fediverse instance that uses the ActivityPub protocol. In other words, users at this host can communicate with people that use software like Mastodon, Pleroma, Friendica, etc. all around the world.
This server runs the snac software and there is no automatic sign-up process.
You can now finally acces the webui of this instance again. This entire issue was caused by a faulty docker image.
Webui can be accessed at https://foxes.download/apc