Azure VM is not accessible through RDP?

Question

Hi there, we have deployed a VM a month which was working for days back. However, from today, we are not able to access it through RDP?

Do we have any solution to this? Any response to solve the issue is appreciated.

Answer 1

Hello @Sivakumaran Ramalingam - Thank you for reaching Microsoft QnA platform

Here are some steps you can try to troubleshoot this issue:

Please Make sure your VM is running. You can check this through the Azure portal.

Verify that your Network Security Group allows inbound RDP (TCP port 3389). You need an inbound rule set to allow traffic on this port. Navigate to the NSG associated with your VM and ensure that there’s a rule with the priority set to allow RDP traffic.

You can use Azure Network Watcher to diagnose connectivity issues. Specifically, the IP Flow Verify tool can help you determine if a rule is blocking traffic to your VM. You might also want to reset the RDP configuration on your VM. This can be done using the Azure portal or through PowerShell commands (you can refer to the documentation for the exact steps).

Please ensure that the Windows Firewall on your VM is not blocking the RDP port. If there's an active firewall, you may need to create an exception for RDP. If you're still having problems, try using Azure Bastion to connect to your VM. It allows you to securely connect to your VM without exposing it directly to the public internet.

You can also enable Boot Diagnostics on your VM to check if there are any boot-related issues. If none of the above work, consider redeploying your VM, which often resolves connectivity issues.

If you’re still unable to connect post these checks, use the diagnostic tools available in the Azure portal for more insights.

Below here is list of Microsoft links for more detailed information:

• Troubleshoot Remote Desktop connections to an Azure virtual machine
• Network Security Groups Overview
• Azure Network Watcher
• Using Azure Bastion
• Boot Diagnostics for Azure VMs