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btw. I also don’t see the images in the “featured charts”. I get this when I look at the image source:

Do you have a proxy or firewall between your nodes and the Internet that is doing TLS interception / SSL decrypt for security purposes?

thanks for your help! all nodes are running as VMs in a proxmox cluster and from the node’s shell it works. after reading your comments I had the idea to test DNS resolution and the problem is here: github.com is resolved to the IP of my proxmox host server. github.com. (with a . at the end) however is resolved correctly. When I add a . to the hostname also adding a helm repo works. So there must be something wrong in the DNS config, I’ll keep you updated in case someone else has a similar issue.