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articles/network-watcher/diagnose-vm-network-traffic-filtering-problem-powershell.md

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ms.author: halkazwini
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ms.service: azure-network-watcher
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ms.topic: quickstart
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ms.date: 08/23/2023
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ms.date: 09/30/2024
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ms.custom: devx-track-azurepowershell, mode-api
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#Customer intent: I want to diagnose a virtual machine (VM) network traffic filter using IP flow verify to know which security rule is denying the traffic and causing the communication problem to the VM.
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# Quickstart: Diagnose a virtual machine network traffic filter problem using Azure PowerShell
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In this quickstart, you deploy a virtual machine and use Network Watcher [IP flow verify](network-watcher-ip-flow-verify-overview.md) to test the connectivity to and from different IP addresses. Using the IP flow verify results, you determine the security rule that's blocking the traffic and causing the communication failure and learn how you can resolve it. You also learn how to use the [effective security rules](effective-security-rules-overview.md) for a network interface to determine why a security rule is allowing or denying traffic.
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:::image type="content" source="./media/diagnose-vm-network-traffic-filtering-problem-cli/ip-flow-verify-quickstart-diagram.png" alt-text="Diagram shows the resources created in Network Watcher quickstart." lightbox="./media/diagnose-vm-network-traffic-filtering-problem-cli/ip-flow-verify-quickstart-diagram.png":::
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:::image type="content" source="./media/diagnose-vm-network-traffic-filtering-problem-cli/ip-flow-verify-quickstart-diagram.png" alt-text="Diagram shows the resources created in Network Watcher quickstart.":::
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If you don't have an Azure subscription, create a [free account](https://azure.microsoft.com/free/?WT.mc_id=A261C142F) before you begin.
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Remove-AzResourceGroup -Name 'myResourceGroup' -Force
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```
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## Next steps
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In this quickstart, you created a VM and diagnosed inbound and outbound network traffic filters. You learned that network security group rules allow or deny traffic to and from a VM. Learn more about [security rules](../virtual-network/network-security-groups-overview.md?toc=%2fazure%2fnetwork-watcher%2ftoc.json) and how to [create security rules](../virtual-network/manage-network-security-group.md?toc=%2fazure%2fnetwork-watcher%2ftoc.json#create-a-security-rule).
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## Next step
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Even with the proper network traffic filters in place, communication to a virtual machine can still fail, due to routing configuration. To learn how to diagnose virtual machine routing problems, see [Diagnose a virtual machine network routing problem](diagnose-vm-network-routing-problem-powershell.md). To diagnose outbound routing, latency, and traffic filtering problems with one tool, see [Troubleshoot connections with Azure Network Watcher](network-watcher-connectivity-powershell.md).
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> [!div class="nextstepaction"]
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> [Diagnose a virtual machine network routing problem](diagnose-vm-network-routing-problem.md)

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