Not able to connect to Update Site: Connection Failure: Status code unavailable.

I know I am late to this "party," but I think I discovered a trick within the CF Administrator that seems to work.  From Package Manager > Available Packages uninstall one package.  I am not sure it matters, but I selected MySQL.  Then, reinstall that package.  I received a message that read CF will install Update 10 (the latest at the time of this writing) and all other updates before reinstalling MySQL.  I proceeded, and although I had to restart CF manually, the latest updates were installed along with the reinstall of the MySQL package.  This worked on two different machines with CF2021.

Some steps to try:

1.  Restart ColdFusion.
2.  Clear the browser cache and/or change to a new browser before opening the ColdFusion Administrator page.
3.  Go to the Package Manager page in the Administrator, and locate the section Update Site. Verify that the value of Site URL is  https://www.adobe.com/go/coldfusion-updates.
        If it isn't, then enter that value and press the button Submit Changes. 

Also, @jascomp , can you let us know if you are using the CF2021 installer released last month? Or are you perhaps still using one from earlier this year or late last year?

The reason I ask is that the original one came installed with Java 11.0.1--which is 3 years old this week. That was a mistake on Adobe's part--and the JVM being that old HAS in fact caused problems for many, including and especially this inability to access the CF updates from the Admin (in some cases, not all, for some reason).

Anyway, the new CF2021 installer (released last month) comes with both Java 11.0.11 (from April of this year) as well as CF2021 update 2 already installed, saving folks lots of trouble. As Priyank noted, you COULD update the JVM to solve this problem in your current deployments (and most SHOULD, to fix other TLS-related issues. I discuss that in this post.)

That said, implementing any version of Java 11.0.11 or higher (or Java 8.0.291 or higher) can introduce a new problem, as those now won't allow calling out to a server via https/tls unless that server at least supports TLS v1.2. That's a JVM thing, not an Adobe thing. You can undo that limitation via a java config property, as I discuss in another blog post from that time.

Hi,

Are you behind proxy? You can install update manually. Please check the instruction in this article. Search for "INSTALL THE UPDATE IN OFFLINE MODE MANUALLY"

https://helpx.adobe.com/coldfusion/kb/coldfusion-2021-update-2.html