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Copy file name to clipboardExpand all lines: articles/frontdoor/troubleshoot-performance-issues.md
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@@ -3,12 +3,12 @@ title: 'General Performance Troubleshooting of Azure Front Door'
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titleSuffix: Azure Front Door
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description: In this article, investigate, diagnose and resolve potential latency or bandwidth issues associated with an Azure Front Door related site performance
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services: frontdoor
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author: stdoroff
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author: sbdoroff
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ms.service: frontdoor
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ms.topic: how-to
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ms.workload: infrastructure-services
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ms.date: 08/30/2023
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ms.author: stdoroff
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ms.author: sbdoroff
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#Customer intent: As a <type of user>, I want <some goal> so that <some reason>.
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---
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@@ -123,7 +123,7 @@ High latency, or low bandwidth, could be because of an ISP issue, the customer i
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### Scenario 2 | Troubleshooting Steps
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1. To check the path to the POP, use [PathPing](https://learn.microsoft.com/windows-server/administration/windows-commands/pathping) or similar tool for 500 packets to check the network route. *PathPing maxes at 250 queries. To test to 500, run the below query twice*
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1. To check the path to the POP, use [PathPing](/windows-server/administration/windows-commands/pathping) or similar tool for 500 packets to check the network route. *PathPing maxes at 250 queries. To test to 500, run the below query twice*
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```Console
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pathping /q 250 <Full URL of Affected File>
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- Origin: origin.contoso.com
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- AFD Custom Domain: contoso.com
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- Page customer attempts to load: https://contoso.com
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- **Explanation**: When the page loads, the initial file at the "/" directory calls other files, which build the page. These files are images, JavaScript, text files and more. If those files aren't called via the AFD hostname, *contoso.com*, the AFD is ***not*** being utilized. So, if one of the file requested by the website is *http://www.images.fabrikam.com/businessimage.jpg* the file is ***not*** benefiting from the use of the AFD. Instead, the file is being requested directly, from the *images.fabrikam.com* server, by the browser on the requesting client.
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- **Explanation**: When the page loads, the initial file at the "/" directory calls other files, which build the page. These files are images, JavaScript, text files and more. If those files aren't called via the AFD hostname, *contoso.com*, the AFD is ***not*** being utilized. So, if one of the file requested by the website is *`http://www.images.fabrikam.com/businessimage.jpg`* the file is ***not*** benefiting from the use of the AFD. Instead, the file is being requested directly, from the *`images.fabrikam.com`* server, by the browser on the requesting client.
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:::image type="complex" source="media/troubleshoot-performance-issues/AFDCDNPerformance.jpg" alt-text="Example of multiple, differently sourced files for a singular website and how it affects AFD performance":::
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@@ -171,7 +171,7 @@ A webpage often consists of many files. The way the website benefits from the A
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> Developer tools in your browser can be used to determine the source of the files being served
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1. Note the source of files
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1. Identify which files are utilizing the AFD hostname and which aren't
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A. Example: From the above example, an AFD hosted image would be something like https://www.contoso.com/productimage1.jpg and that which wouldn't is something like http://www.images.fabrikam.com/businessimage.jpg
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A. Example: From the above example, an AFD hosted image would be something like `https://www.contoso.com/productimage1.jpg` and that which wouldn't is something like `http://www.images.fabrikam.com/businessimage.jpg`
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1. Once gathered test performance for file being served from AFD, its origin and, if applicable, the testing webpage
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> [!IMPORTANT]
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> If the origin or testing webpage is served from a geographical region closer to the tool testing performance, a tool or requesting client may need to be used in another region to examine the AFD POP's proximity benefit
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