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| Site / Resource | Protocol | Comments |
|---|---|---|
| hub.docker.com | https | Required for access to docker hub repository for downloading container images. |
| dockerhub.jtel.de | https | Required for access to the jtel docker repository for downloading container images. |
| bitbucket.org | ssh | Bitbucket is phasing out https cloning of repositories, ssh is required to clone the necessary resources. |
| cdn.jtel.de | https | Required to download some packages. |
| debian.org | https | Required for updating the operating system - access to the official debian repositories. |
| windows.net | https | Required for access to the azure worm blob storage account for creating / retrieving backups of the system. |