The v2 SKU automatically ensures that new instances are spread across fault domains and update domains. If you choose zone redundancy, the newest instances are also spread across availability zones to offer zonal failure resiliency.
Use Traffic Manager to distribute traffic across multiple application gateways in different datacenters. For more information, see Autoscaling and Zone-redundant Application Gateway. You can set up connection draining to change members within a backend pool without disruption.
For more information, see connection draining section of Application Gateway. Application Gateway is always deployed in a virtual network subnet.
This subnet can contain only application gateways. For more information, see virtual network and subnet requirements.
As long as you have IP connectivity, Application Gateway can communicate with instances outside of the virtual network that it's in.
Application Gateway can also communicate with instances outside of the subscription it's in. You can move an Application Gateway across subnets within the same virtual network only. It is supported with V1 with public and private frontend, and V2 with public frontend only. It is also important to note that the Application Gateway should be in a Stopped state to perform this action. See Network security groups in the Application Gateway subnet.
See User-defined routes supported in the Application Gateway subnet. Service endpoint policies for storage accounts are not supported in Application Gateway subnet and configuring it will block Azure infrastructure traffic. See Application Gateway limits. Microservice architecture is supported.
To probe on different ports, you need to configure multiple HTTP settings. See Order of processing rules. The Host field specifies the name to send the probe to when you've configured multisite on Application Gateway. Otherwise use ' This value is different from the virtual machine host name.
See restrict access to specific source IPs. Application Gateway v2 does not currently support IPv6. Application Gateway v1 does not support dual stack VNets. Application Gateway V2 currently does not support only private IP mode. It supports the following combinations. But if you'd like to use Application Gateway V2 with only private IP, you can follow the process below:.
Do not create any listeners for the public frontend IP address. Application Gateway will not listen to any traffic on the public IP address if no listeners are created for it. Create and attach a Network Security Group for the Application Gateway subnet with the following configuration in the order of priority:.
This port range is required for Azure infrastructure communication. These ports are protected locked down by certificate authentication. External entities, including the Gateway user administrators, can't initiate changes on those endpoints without appropriate certificates in place.
Deny all inbound traffic from Source as Internet service tag and Destination and destination port as Any. Give this rule the least priority in the inbound rules.
You can use different types of logs in Azure to manage and troubleshoot application gateways. You can access some of these logs through the portal.
You can learn more about the different types of logs from the following list:. Logs are available only for resources deployed in the Azure Resource Manager deployment model. You cannot use logs for resources in the classic deployment model.
For a better understanding of the two models, see the Understanding Resource Manager deployment and classic deployment article. Activity logging is automatically enabled for every Resource Manager resource. You must enable access and performance logging to start collecting the data available through those logs. To enable logging, use the following steps:.
Note your storage account's resource ID, where the log data is stored. You can use any storage account in your subscription. You can use the Azure portal to find this information. Note your application gateway's resource ID for which logging is enabled. You can use the portal to find this information. Activity logs do not require a separate storage account. The use of storage for access and performance logging incurs service charges.
The Diagnostics settings page provides the settings for the diagnostic logs. In this example, Log Analytics stores the logs. You can also use event hubs and a storage account to save the diagnostic logs. Azure generates the activity log by default. The logs are preserved for 90 days in the Azure event logs store. Learn more about these logs by reading the View events and activity log article.
Related Questions. You must be Logged on to comment or reply to a post. Joel Sanchez. Like 0 Share. Right click and copy the link to share this comment. Bilal Muhammad Blog Post Author. Hi Joel,. Hi Bilal! Michael Smith. Link Text. Open link in a new tab. In Application Gateway v2, if the application gateway does not receive a response from the back-end application in this interval, the request will be tried against a second back-end pool member.
If the second request fails the user request gets a error. Application Gateway allows you to configure this setting via the BackendHttpSetting, which can be then applied to different pools. Different back-end pools can have different BackendHttpSetting, and a different request time-out configured.
If the application gateway has no VMs or virtual machine scale set configured in the back-end address pool, it can't route any customer request and sends a bad gateway error. Ensure that the back-end address pool isn't empty. The output from the preceding cmdlet should contain non-empty back-end address pool. The provisioning state of the BackendAddressPool must be 'Succeeded'. If all the instances of BackendAddressPool are unhealthy, then the application gateway doesn't have any back-end to route user request to.
This can also be the case when back-end instances are healthy but don't have the required application deployed.
Ensure that the instances are healthy and the application is properly configured. Check if the back-end instances can respond to a ping from another VM in the same VNet.
If configured with a public end point, ensure a browser request to the web application is serviceable.
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