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Message Blocked by Content Security Policy. The following problems have the same solution.

Problem

When you click an external contribution in a configuration tree, you don't see its information in the details section on the right side of the page, the configuration picker in the Add Configurations dialog box is empty, and the Firefox web browser shows a Blocked by Content Security Policy message.

Solution

Complete the following steps:
  1. Add a friend relationship from the Global Configuration Management server that contains the external contribution to the home Global Configuration Management server.
  2. Disable the Prevent clickjacking (Content-Security-Policy) advanced server property in the Global Configuration Management application.
  3. On the Advanced Server Properties page, add the blocked server name to the Current value list of the Clickjacking allowlist property. Use a fully qualified server name such as https://host:port.