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Copy file name to clipboardExpand all lines: articles/network-watcher/diagnose-communication-problem-between-networks.md
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title: 'Tutorial: Diagnose communication problem between virtual networks - Azure portal'
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titleSuffix: Azure Network Watcher
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description: In this tutorial, you learn how to use Azure Network Watcher VPN diagnostics to troubleshoot a communication problem between two Azure virtual networks connected by Azure VPN gateways.
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description: In this tutorial, you learn how to use Azure Network Watcher VPN troubleshoot to diagnose a communication problem between two Azure virtual networks connected by Azure VPN gateways.
# Tutorial: Diagnose a communication problem between virtual networks using the Azure portal
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Azure VPN gateway is a type of virtual network gateway that you can use to send encrypted traffic between an Azure virtual network and your on-premises locations over the public internet. You can also use VPN gateway to send encrypted traffic between Azure virtual networks over the Microsoft network. Multiple connections can be created to the same VPN gateway. You can use Azure Network Watcher to troubleshoot and diagnose a VPN gateway and its connections.
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Azure VPN gateway is a type of virtual network gateway that you can use to send encrypted traffic between an Azure virtual network and your on-premises locations over the public internet. You can also use VPN gateway to send encrypted traffic between Azure virtual networks over the Microsoft network. A VPN gateway allows you to create multiple connections to on-premises VPN devices and Azure VPN gateways. For more information about the number of connections that you can create with each VPN gateway SKU, see [Gateway SKUs](../../articles/vpn-gateway/vpn-gateway-about-vpngateways.md#gwsku). Whenever you need to troubleshoot an issue with a VPN gateway or one of its connections, you can use Azure Network Watcher VPN troubleshoot to help you checking the VPN gateway or its connections to find and resolve the problem in easy and simple steps.
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In this tutorial, you connect two virtual networks via VPN gateways using VNet-to-VNet connections and use Network Watcher VPN troubleshoot capability to diagnose and troubleshoot a connectivity issue that's preventing the two virtual networks from communicating with each other. Once you find the issue and resolve it, you check the connectivity between the two virtual networks to verify the problem was resolved.
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This tutorial helps you connect two virtual networks via VPN gateways using VNet-to-VNet connections and use Network Watcher VPN troubleshoot capability to diagnose and troubleshoot a connectivity issue that's preventing the two virtual networks from communicating with each other. Once you find the issue and resolve it, you check the connectivity between the two virtual networks to verify the problem was resolved.
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In this tutorial, you learn how to:
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### Create first virtual network
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1. In the search box at the top of the portal, enter *virtual networks*. Select **Virtual networks** in the search results.
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1. In the search box at the top of the portal, enter *virtual network*. Select **Virtual networks** in the search results.
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:::image type="content" source="./media/diagnose-communication-problem-between-networks/virtual-network-azure-portal.png" alt-text="Screenshot shows searching for virtual networks in the Azure portal.":::
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1. Select **+ Create**. In **Create virtual network**, enter or select the following in the **Basics** tab:
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1. Select **+ Create**. In **Create virtual network**, enter or select the following values in the **Basics** tab:
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| Setting | Value |
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| --- | --- |
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| Subnet name | Enter *mySubnet*. |
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| Subnet address range | Enter *10.1.0.0/24*. |
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1. Select the **Security** tab, or select the **Next: Security** button at the bottom of the page.
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1. Under **BastionHost**, select **Enable** and enter the following:
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| Setting | Value |
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| --- | --- |
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| Bastion name | Enter *myBastionHost*. |
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| AzureBastionSubnet address space | Enter *10.0.3.0/24*. |
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| Public IP Address | Select **Create new**. </br> Enter *myBastionIP* for **Name**. </br> Select **OK**. |
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1. Select the **Review + create** tab or select the **Review + create** button.
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1. Select the **Review + create** tab or select the **Review + create** button at the bottom of the page.
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1. Review the settings, and then select **Create**.
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If you have a storage account that you want to use, you can skip the following steps and go to [Create VPN gateways](#create-vpn-gateways).
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1. In the search box at the top of the portal, enter *storage accounts*. Select **Storage accounts** in the search results.
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1. In the search box at the top of the portal, enter *storage account*. Select **Storage accounts** in the search results.
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1. Select **+ Create**. In **Create a storage account**, enter or select the following in the **Basics** tab:
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1. Select **+ Create**. In **Create a storage account**, enter or select the following values in the **Basics** tab:
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| Setting | Value |
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| --- | --- |
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1. Select the **Networking** tab, or select **Next: Advanced** and then **Next: Networking** button at the bottom of the page.
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1. Under **Network connectivity**, select **Disable public access and use private access**.
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1. Under **Network connectivity**, select **Enable public access from all networks**.
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1. Select the **Review** tab or select the **Review** button.
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1. Select **+ Container**.
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1. In **New container**, enter or select the following then select **Create**.
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1. In **New container**, enter or select the following values then select **Create**.
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| Setting | Value |
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| --- | --- |
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### Create first VPN gateway
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1. In the search box at the top of the portal, enter *virtual network gateways*. Select **Virtual network gateways** in the search results.
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1. In the search box at the top of the portal, enter *virtual network gateway*. Select **Virtual network gateways** in the search results.
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1. Select **+ Create**. In **Create virtual network gateway**, enter or select the following in the **Basics** tab:
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1. Select **+ Create**. In **Create virtual network gateway**, enter or select the following values in the **Basics** tab:
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| Setting | Value |
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| --- | --- |
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## Next steps
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In this tutorial, you learned how to diagnose a problem with a virtual network gateway. You may want to log network communication to and from a VM so that you can review the log for anomalies. To learn how, advance to the next tutorial.
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In this tutorial, you learned how to diagnose a connectivity problem between two connected virtual networks via VPN gateways. For more information about connecting virtual networks using VPN gateways, see [VNet-to-VNet connections](../../articles/vpn-gateway/design.md#V2V).
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To learn how to log network communication to and from a virtual machine so that you can review the log for anomalies, advance to the next tutorial.
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> [!div class="nextstepaction"]
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> [Log network traffic to and from a VM](network-watcher-nsg-flow-logging-portal.md)
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