> For the complete documentation index, see [llms.txt](https://docs-launchpad.energyweb.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-launchpad.energyweb.org/energy-solutions/digital-spine-by-energy-web/component-guides/ddhub-client-gateway/deployment-guide/preparing-to-set-up-a-client-gateway/inbound-and-outbound-connections.md).

# Inbound and Outbound Connections

<table><thead><tr><th width="253.1328125">Name</th><th width="344.26953125">URL</th><th width="105.32421875">Inbound</th><th width="113.09375">Outbound</th><th width="138.50390625">mTLS Access</th></tr></thead><tbody><tr><td>Digital Spine Message Broker</td><td>https://ddhub-ewc.energyweb.org</td><td>No</td><td>Yes</td><td>Yes</td></tr><tr><td>EWC RPC</td><td>https://rpc.energyweb.org</td><td>No</td><td>Yes</td><td>No</td></tr><tr><td>SSI-HUB</td><td>https://identitycache.energyweb.org</td><td>No</td><td>Yes</td><td>No</td></tr></tbody></table>