It appears that the Adobe server is down, and as a result, I am unable to use it.
Not for me.
What does HTTP error 500 mean?
HTTP error 500 basically means, “Something’s gone wrong with the server. Couldn’t tell you what, but it’s definitely not working right.” There’s usually no problem with your browser or your internet connection when you see this error message. It’s a problem with the website’s server.
You might also see this error message displayed as “500 internal server error” or “error 500”, but they all mean the same thing: The website’s experiencing server trouble.
Check again later. Adobe has many web servers spread over the world to distribute the load. It's probably a local outage.
You can check this URL, to see if there is some reported issue in your region: https://status.adobe.com/