SIRIS, ALTO, and NAS: Datto Linux Agent: “Backup Failed Due to a Problem Establishing Secure Communications With the Agent.”



When you try to start a backup for a system protected by the Datto Linux Agent, you receive the error message, "BK202: Backup failed due to a problem establishing secure communications with the agent.


  • Datto ALTO
  • Datto SIRIS
  • Datto Linux Agent


The Datto appliance attempted to contact the agent on the protected machine, but it received an "Error 401 (unauthorized)" response.


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