Bastion with Azure VM Windows 10

Hi @ StarlightNY Support,

Welcome to Microsoft Q&A Platform.

In many cases, a Network Security Group (NSG) applied to the AzureBastionSubnet or the target VM subnet is blocking RDP or SSH traffic within the virtual network.

Please make sure to check the below steps to resolve your issue.

Allow WebSockets Traffic Ensure that WebSockets traffic is allowed on your client internet firewall.

Run VM Diagnostics Run resource diagnostics on the VM to verify:

• If the VM is running
• Network Level Authentication (NLA) status

Check Network Security Groups (NSGs)

Verify that NSG rules allow the required protocols (RDP for Windows, SSH for Linux).

If an NSG is applied to the AzureBastionSubnet, ensure it contains the correct rules to support Bastion.

Use Network Watcher – Connection Troubleshoot Use Azure Network Watcher’s Connection Troubleshoot feature from the Bastion instance to validate direct TCP connectivity to the VM.

Redeploy the VM (If Needed) If diagnostics do not identify any issues, redeploying the VM can sometimes resolve underlying connectivity problems.

A network connectivity issue between your web browser and Azure Bastion (for example, your client-side internet firewall may be blocking WebSockets traffic).

If the solution is not helpful, please share the required details so we can connect on a Teams call and troubleshoot the issue together

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Hello @ StarlightNY Support,

• I have started a private message with you. Please review the private chat and share the required details so we can proceed with investigating the issue.