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Metadata files for the CKANProject mention: CKAN not updating | reddit.com/r/KerbalSpaceProgram | 2021-11-14
We had Windows users in the past where some GitHub domains were overridden in the hosts file, maybe check that. Also check if you can access https://raw.githubusercontent.com/KSP-CKAN/CKAN-meta/master/repositories.json and https://github.com/KSP-CKAN/CKAN-meta/archive/master.tar.gz in your browser. If it works, it means something is interfering with CKAN specifically, if not, you know that it is blocked system-wide.
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