For the first, gdmf.apple.com, I get that the host is resolved, and a 404 not found The second succeeds to "download.developer.apple.com", but I get a redirect to a page with the title "Document Has Moved" On the third to devimages-cdn.apple.com, I get a 403 forbidden, access denied. Going to look at that thread now.

Ah, figured it out. I have a build script that makes a dynamic file before sources are compiles with version & build info. The SwiftUI dependency analyzer gets confused and thinks this is too late and that I modified the source again and pauses updates due to source changes. Shot myself in the foot.