403 Forbidden Microsoft Azure Application Gateway V2 Troubleshooting Guide

The 403 Forbidden error in Microsoft Azure Application Gateway V2 can be frustrating, especially when you're not sure what's causing it. This troubleshooting guide will walk you through the possible causes and solutions to get your Application Gateway up and running smoothly.

One of the first things to check is the backend pool configuration, as incorrect settings can lead to a 403 Forbidden error. Ensure that the backend pool is properly configured and that the target instances are healthy.

A common issue is the absence of a default HTTP setting, which can cause the Application Gateway to return a 403 Forbidden error. To resolve this, create a default HTTP setting and assign it to the HTTP listener.

Double-check the authentication and authorization settings, as misconfigured settings can also cause a 403 Forbidden error. Make sure that the authentication and authorization settings are correctly configured for the backend pool.

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A 403 Forbidden error on your Microsoft Azure Application Gateway v2 can be frustrating, but understanding the root cause can help you resolve the issue quickly. This error typically indicates that the server is blocking access to a specific URL or resource.

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The error can be caused by the Application Gateway WAF (Web Application Firewall) itself. In one case, a user found that the error was triggered by the WAF when accessing a specific URL via a custom domain. The error didn't occur when accessing the same URL using the azurewebsites.net domain provided by Azure.

To troubleshoot the issue, it's essential to check both the Application Gateway and App Service logs to determine where the error is originating from. In this case, the user confirmed that setting the WAF in Prevention Mode resolved the issue.

However, disabling the WAF entirely is not a recommended solution as it makes your Application Gateway vulnerable to attacks. Instead, you should only disable the specific rule in the CRS (Core Rule Set) that's causing the 403 error. To do this, you'll need to customize the WAF rules and find out which rule is being triggered.

Here are the steps to customize the WAF rules:

1. Check the WAF logs to identify which rule is causing the 403 error.

2. Disable the specific rule in the CRS that's causing the issue.

3. Consider creating custom rules or exclusion lists to allow access to the specific URL or resource.

By following these steps, you can resolve the 403 Forbidden error on your Microsoft Azure Application Gateway v2 and ensure that your application is accessible to users.

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You're experiencing a 403 Forbidden error on your Microsoft Azure Application Gateway v2, and you're not sure what to do. This error can be frustrating, especially if you're trying to access a public website like psdb.org.br.

The website in question is related to the party that won the government elections in Brazil, and you'd expect the content to be public. However, you're greeted with a Microsoft Azure Application Gateway v2 - 403 Forbidden error instead.

If you're experiencing similar issues, you're not alone. Barbara Grote, a user on the Microsoft Azure support forum, has reported similar problems with her online banking access. She's unable to access certain icons on her banking website, and is getting a 403 Forbidden error from Microsoft Azure.

If you're experiencing issues like this, you can report a concern on the Microsoft Azure support forum. In fact, Barbara Grote has already done so, and has even asked Microsoft to take action.

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Here are some examples of reported issues on the Microsoft Azure support forum:

It's worth noting that Barbara Grote's issues may or may not be related to scheduled maintenance. However, reporting a concern on the Microsoft Azure support forum is a good place to start if you're experiencing similar problems.

Clearing your cache can resolve a 403 Forbidden error in Azure. This is because links may have been updated, and your browser cached the old version of the page.

The Azure Web Application Firewall (WAF) might be preventing you from accessing certain content, so check your firewall logs to see if it's blocking your request.

A 403 Forbidden error can also occur if you don't have permission to view a certain file, folder, or directory. This typically happens because of misconfigured access rules.

You can try disabling the WAF rule that's causing the issue. To do this, use the WAF Logs to find out which Rule is being triggered.

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Custom Rules and Exclusion Lists are dependent on your application and should be configured with the help of your application team.

Here are some possible causes of a 403 Forbidden error in Azure: