> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/ras-admin-guide/v20-en-us/parallels-ras-20-administrators-guide/ras-multi-tenant-architecture/deploying-tenant-broker-and-tenants/user-authentication.md).

# User authentication

User authentication in the RAS multi-tenant architecture is performed by the RAS Connection Broker running in the Tenant Farm. The Connection Broker is selected randomly by a shared RAS Secure Gateway. If the Connection Broker is unavailable, then it's marked accordingly and no communication is conducted with it from the same shared gateway for a period of time. The gateway checks the Connection Broker status periodically and resumes communications as soon as the agent becomes available.


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