System and Network Extensions are fairly easy programmatically. However, there is some nuance around building them. Much of this is in getting the correct entitlements – but also a little in troubleshooting. To see (or set) those entitlements, look at the .entitlements file located in the root of an Xcode Project. That will be a plist with a few entries. In this one, we’ll see com.apple.developer.networking.networkextension so we’re working on a network extension. com.apple.security.app-sandbox com.apple.security.application-groups $(TeamIdentifierPrefix)com.krypted.firewall com.apple.developer.networking.networkextension content-filter-provider To add one, go to the General screen for the project, and locate the section for Frameworks, Libraries, and Embedded Content. Then use the plus sign to add and provide the name…