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<!-- Please inform yourself about the contribution guidelines on submitting a PR here: https://github.com/zitadel/zitadel/blob/main/CONTRIBUTING.md#submit-a-pull-request-pr. Take note of how PR/commit titles should be written and replace the template texts in the sections below. Don't remove any of the sections. It is important that the commit history clearly shows what is changed and why. Important: By submitting a contribution you agree to the terms from our Licensing Policy as described here: https://github.com/zitadel/zitadel/blob/main/LICENSING.md#community-contributions. --> # Which Problems Are Solved A customer reached out that after an upgrade, actions would always fail with the error "host is denied" when calling an external API. This is due to a security fix (https://github.com/zitadel/zitadel/security/advisories/GHSA-6cf5-w9h3-4rqv), where a DNS lookup was added to check whether the host name resolves to a denied IP or subnet. If the lookup fails due to the internal DNS setup, the action fails as well. Additionally, the lookup was also performed when the deny list was empty. # How the Problems Are Solved - Prevent DNS lookup when deny list is empty - Properly initiate deny list and prevent empty entries # Additional Changes - Log the reason for blocked address (domain, IP, subnet) # Additional Context - reported by a customer - needs backport to 2.70.x, 2.71.x and 3.0.0 rc