Azure bastion works RDP fails

Question

trying to troubleshoot why connecting to the bastion works but RDP fails inbound and outbound.

added an inbound /outbound rule to the NSG and still fails.

where can i get more information from the logs. logs are probably off too

Answer 1

Hi Efff,

It looks like your are having problems to connect to your Azure VM trought a Bastion. I understood that you already verify that the Bastion is working, But just to be sure do a quick check:

• Verify Bastion Status: Confirm the Azure Bastion service is in a "Succeeded" state.
• Firewall Settings: Confirm local or intermediary firewalls are not blocking port 3389.
• Monitor Logs: Use Azure Monitor Logs to analyze data from Azure resources.

Lets continue with the VM Troubleshooting Steps for RDP without Azure Bastion:

• Verify VM Configuration: Confirm the VM is running and configured for RDP.
• Firewall Settings: Ensure Windows Firewall and intermediary firewalls allow RDP on port 3389.
• RDP Service Check: Verify the RDP service is running on the VM.
• (Most Important)Test Local RDP Connection: Connect to the VM locally within the same virtual network to ensure RDP works.
• (You already did it but an additional check never is a mistake)Check NSG Rules: Ensure NSG rules allow inbound and outbound traffic on port 3389.
• Check IP Restrictions: Ensure there are no IP restrictions blocking RDP connections.

Let me know your findings and if you need more support.

References:

• Troubleshoot Azure Bastion | Microsoft Learn
• Azure Bastion documentation | Microsoft Learn
• Azure Monitor Logs - Azure Monitor | Microsoft Learn
• Azure network security groups overview | Microsoft Learn
• Network security group - how it works | Microsoft Learn
• Create, change, or delete an Azure network security group | Microsoft Learn

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If the information helped address your question, please Accept the answer. Luis