Set the proxy URL of the Elastic Package Registry

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Fleet might be unable to access the Elastic Package Registry because Kibana is behind a proxy server.

Also your organization might have network traffic restrictions that prevent Kibana from reaching the public Elastic Package Registry (EPR) endpoints, like epr.elastic.co, to download package metadata and content. You can route traffic to the public endpoint of EPR through a network gateway, then configure proxy settings in the Kibana configuration file, kibana.yml. For example:

xpack.fleet.registryProxyUrl: your-nat-gateway.corp.net