UiPath Documentation
robot
2026.10
false
Robot admin guide

Connection troubleshooting

Troubleshooting steps for Robot connection issues with Orchestrator, including authentication errors and tenant configuration problems.

Interactive sign-in is not enabled for this tenant​

Description​

The tenant you are trying to access does not have authentication enabled.

Potential issue​

The tenant's attended robot authentication doesn't allow user sign-in. This can happen on tenants created in an older version of Orchestrator, before interactive sign-in was available.

Solution​

The proposed solution must be performed by an Orchestrator administrator:

  1. In Orchestrator, go to Tenant > Settings, and open the Robot security tab.
  2. In the Robot authentication section, set attended robot authentication to Interactive Sign-in SSO. Choose Hybrid instead only if attended robots still connect with a machine key.
  3. Select Save.

For the options, refer to Robot authentication.

Interactive connect is not available​

Description​

You cannot connect through the Interactive Sign-In.

Potential issue​

The Robot is installed in Service Mode.

Solution​

When the Robot is installed in Service Mode, connect the service using client credentials first, then proceed with Interactive Sign-In (Service URL).

Robot does not exist​

Description​

You receive the error message "Robot does not exist".

Potential issue​

You might be using a classic robot, which was defined in Orchestrator using the classic method or via the Windows user, and you are already connected to Orchestrator with a machine key. When you then sign in from Studio, a different username is sent to Orchestrator. This applies only to robots connected with a machine key.

Solution​

The proposed solution must be performed by an Orchestrator administrator:

  • In Orchestrator, set up a modern robot, then sign in again.

Cannot acquire a license​

Description​

You receive the error message "Cannot acquire a license".

Potential issue​

Your user account is not properly configured to acquire a license from Orchestrator.

Solution​

The proposed solution must be performed by an Orchestrator administrator:

  • In Orchestrator, edit the problematic user account to execute attended automations, then assign it an Attended license.

To verify the license availability, go to Tenant > License.

No such host in known​

Description​

You receive the error message "No such host in known".

Potential issue​

Connection to Orchestrator could not be established.

Solution​

Verify that your Internet connection is working.

You are not authorized to perform this action​

Description​

You receive the error message "You are not authorized to perform this action".

Potential issue​

The user connected with the machine key associated with one tenant, but then tries to sign in to a different tenant.

Solution​

For User Mode installations, sign in using the service URL.

For Service Mode installation, sign out from the Assistant, then sign in again.

Could not start executor in an RDP setup​

Description​

You receive the error message "Could not start executor. Please ensure the user is allowed to access the computer via Remote Desktop. Original message: Rdp connection failed: ... Last error: 131085".

Potential issue​

The user account used to run the unattended automation runs was not added to the Remote Desktop Users group.

Solution​

Add the user account to the Remote Desktop Users group. For details, see User permissions to run automations.

Robot cannot connect to an Automation Suite Orchestrator instance​

Description​

When trying to connect or sign in to an Orchestrator provided with Automation Suite 2024.10, you may encounter this error: "System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception."

This issue affects Windows 10.

Potential issue​

Automation Suite 2024.10, which hosts the Orchestrator instance you want to connect to, uses TLS 1.3 by default. Windows 10 does not support this version.

Solution​

You have two options:

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