@lbr31 and @CodeSalat in my case, I changed the dns setttings provided for dhcp clients on my router to use Quad9 9.9.9.9 rather than Cloudflare 1.1.1.1 and the connectivity check works again. Something at Kuketz / Cloudflare (and maybe others if you have the issues) was not happy, and Cloudflare was not resolving connectivity.kuketz.de (which is the default connectivity check site used in iodéOS). Please follow up to my latest post in that thread.
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