Skip to main content

Troubleshooting performance testing

Consult the list of common errors and debugging failed scenarios.

Selector not found.

Solution: Update UI selectors and validate in Studio.

Package mismatch.

Solution: Upgrade to supported package versions and redeploy.

Robot connection issues.

Solution: Check Orchestrator configuration and credentials.

Debugging failed scenarios.

Solution: Use application logs, drill into HTTP error details, and analyze infrastructure usage charts to isolate root causes.

Troubleshooting Missing PT Metrics (Port 5671 Blocked)​

If Performance Testing charts are empty or metrics are missing, it may be caused by a firewall blocking Port 5671, which is required for communication with Azure Event Hub. The UiPath Robot uses this port to send performance metrics to the Performance Testing Service. If the port is blocked, metrics cannot be transmitted.

Context​

  • Communication protocol
    • Protocol: AMQP (Advanced Message Queuing Protocol)
    • Transport: TCP
    • Port: 5671
  • Encryption
    • All communication is secured using TLS 1.2.
    • Encryption in transit is enforced by Azure Event Hub.
    • Data at rest is encrypted using Microsoft-managed keys UiPath does not apply additional encryption at the application layer.
  • Authentication
    • Authentication is handled using Shared Access Signature (SAS) tokens.
    • Tokens are issued and validated by Azure Event Hub.
    • Only authenticated clients can publish messages.
  • Endpoint details
    • Endpoint format: *.http://servicebus.windows.net|servicebus.windows.net.
    • Service: Azure Event Hub (Microsoft Azure managed service).
  • Architecture overview
    1. The Robot sends performance metrics using AMQP over TLS.
    2. Data is transmitted to Azure Event Hub.
    3. The Performance Testing service consumes the events.
    4. Metrics are processed and displayed in dashboards.

Solution​

  1. Run the following command on the Robot machine using Windows PowerShell. 
    Test-NetConnection -ComputerName tmh-prod-tmh-eus-ehn.servicebus.windows.net -Port 5671
  2. Interpret the results.
    • Port is open (Expected). This means the Robot can successfully communicate with Azure Event Hub. 
      TcpTestSucceeded : True
    • Port is blocked. This indicates that the firewall is blocking outbound communication on Port 5671. 
      WARNING: TCP connect to (x.x.x.x : 5671) failed
      TcpTestSucceeded : False

Allow the following outbound connection (firewall rule).

 ```
 ProtocolPortDestinationTCP5671*.http://servicebus.windows.net|servicebus.windows.net
 ```

Additional information​

  • If port 5671 is blocked, performance metrics cannot be delivered, resulting in empty charts.
  • If connectivity is successful but metrics are still missing, further investigation of Robot logs is required.