Cant Update or Install Most Software on ODroid HC2

I’m fairly new to diet pi and installed on my odroid HC2 last week. I’ve had no issues until a couple of days ago when I had to do a reinstall. Now when I try to do any updates, or install software, I get an error message during the download:
Unable to connect to
Is there a server down? Alternatively, I have this running on a Raspberry Pi 3B and have zero issues.

I’m guessing the server was just down a few days, because now software is able to install and updates finish without the error.