Private Link/Endpoint and Run Command not working

Please considering this:

• Command Plug Installation:
  • Ensure that the Command Plug is installed on the affected servers. The Arc Agent might not automatically install all required components after reinstallation. You can manually verify or reinstall the Command Plug.
• Private Endpoint Configuration:
  • Double-check the Private Endpoint DNS configuration. Ensure that all required FQDNs (e.g., his.arc.azure.com, guestconfiguration.azure.com, kubernetesconfiguration.azure.com) resolve correctly to the private IPs.
  • Validate that the Conditional Forwarders are correctly set up and associated with the appropriate virtual network.
• Network Security Groups (NSGs):
  • Review the NSG rules for the subnet where the private endpoint is located. Ensure that outbound traffic to the required Azure services is allowed.
• User-Defined Routes (UDRs):
  • Verify that the UDRs are correctly configured to route traffic to the private endpoint. Misconfigured routes can cause connectivity issues.
• Arc Agent Logs:
  • Check the logs for the Arc Agent on the affected servers. They might provide insights into why the RunCommand function is failing.
• Azure Monitor and Diagnostics:
  • Use Azure Monitor to check if data is flowing through the private endpoint. Metrics like "Bytes In" and "Bytes Out" can help confirm connectivity.
• Testing with Network Watcher:
  • Use Azure Network Watcher to test connectivity from the affected servers to the private endpoint. This can help identify any DNS or routing issues.