"User registration is currently not allowed."

If you can’t connect to the internet, then I’m assuming you’re not actually connecting to your live site ?? Possibly what you’re seeing is a local cached version? Wait until your internet is back up and then try again.

My internet is now working correctly, but I still can’t get in. I just tried it on different computers. Maybe there’s something wrong with the network? (Or a hacker? :0 Oh, I hope not.)

If you’re getting a user registration error, then maybe you’re trying to log in via a registration screen/form rather than the login screen? Try going to https://www.yourdomain.com/wp-login.php (replacing ‘yourdomain.com’ with your actual domain name and extension) and see if that works.

Success! But I still can’t get into the regular non-php one, though…

What do you mean? https://www.yourdomain.com/wp-admin ?

Yeah, that one. Sorry about that…my server was about to crash on me and I had to type really fast…

Are you still having problems with this? You mentioned your server was about to crash… perhaps there are some server-side issues involved here?

Yep, I’m still having problems with my server. If I go to some website or reload a page, it suddenly “can’t find the server” or “oops, link appears to be broken.” The screen would be like that for a few minutes, then get back to normal. It’s been going on for about 4-5 months now, and I still have no idea what’s causing it. It might be AVG-related, but that’s my best guess.

If you suspect AVG, I’d suggest removing it (and installing another anti-virus program so that you’re protected) to see if that makes the problem go away. Otherwise speak to your host and/or ISP.