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#43454 Core file verification unavailable

Posted in ‘Admin Tools for Joomla!’
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Environment Information

Joomla! version
6.2.0
PHP version
8.4
Admin Tools version
7.9.1

Latest post by nicholas on Tuesday, 27 October 2026 05:13 CDT

Tuesday, 27 October 2026 04:53 CDT

[email protected]

Hello, I have this error message:

Core file verification unavailable

The most recent PHP File Change Scanner run could not download the CoreSums checksums data, so files were not verified against the official Joomla core checksums. The scan still completed, but no file was marked as core or non-core. This is usually a temporary network issue. Check the "CoreSums service URL" and "CoreSums download timeout" options in the component configuration if it persists.

 

I have already increased the CoreSums download timeout in 60 seconds and added port 443 on Infomaniak, but I’m still having the same problem on this site. 

What else can we do?

Thank you very much for your answer.

Best regards.

Hugues Fressineau

 

Tuesday, 27 October 2026 05:13 CDT

nicholas

Your host is probably blocking the download of the CoreSums data from our CDN. Tell them to take a look at https://getpanopticon.com/checksums/index.html and whitelist downloads for all URLs matching the glob pattern https://getpanopticon.com/checksums/joomla/*/*.json.gz. 

Do note that this is a CDN – our site is behind CloudFlare. I cannot provide an IP address. The IP address it resolves to depends on the geographic location of your server. The IP is not static either; it is subject to CloudFlare's routing which does change over time.

Nicholas K. Dionysopoulos

Lead Developer and Director

🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!

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