Troubleshooting OAuth2 Error in Microsoft Graph on Windows Server

Discover how to resolve the `WINHTTP_CALLBACK_STATUS_REQUEST_ERROR` in Microsoft Graph API when accessing mailboxes on Windows Server.
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This video is based on the question https://stackoverflow.com/q/71681004/ asked by the user 'Amruth Karanth' ( https://stackoverflow.com/u/18634119/ ) and on the answer https://stackoverflow.com/a/72803853/ provided by the user 'Andrew Teece' ( https://stackoverflow.com/u/9333504/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting OAuth2 Error in Microsoft Graph on Windows Server

In the development world, encountering issues with API calls can be frustrating, especially when a function that works seamlessly on your development machine suddenly fails on a production server. A common error developers face when using Microsoft Graph API on Windows Server is the WINHTTP_CALLBACK_STATUS_REQUEST_ERROR. Let's dive into what this error means and how to resolve it.

Understanding the Issue

While developing an application that utilizes the Microsoft Graph API to access mailboxes, you might come across an error like this when running your application on Windows Server 2012 or 2016:

[[See Video to Reveal this Text or Code Snippet]]

What Does This Error Mean?

This error generally indicates that there is a timeout issue when your application tries to send a request to the Microsoft Graph API. Specifically, it suggests that the WinHTTP request encountered a problem due to the underlying network settings, such as a misconfigured proxy that isn't available or timeout settings being too low.

Steps to Resolve the Error

1. Check Proxy Configuration

A common culprit for this error is a misconfigured proxy that your application is trying to use. Follow these steps to check and resolve the proxy settings:

Open the Command Prompt: Run it as an administrator.

View Current Proxy Settings: Type the command below to check if a proxy is configured.

[[See Video to Reveal this Text or Code Snippet]]

Reset the Proxy: If the proxy settings are from an outdated test scenario or are incorrect, reset the proxy configuration with the following command:

[[See Video to Reveal this Text or Code Snippet]]

This will remove any existing proxy settings and redirect requests through a direct connection, if applicable.

2. Compatibility Issues with Microsoft.Graph NuGet Package

Sometimes, an issue can arise following an update of the Microsoft.Graph NuGet package. If you've recently upgraded your package and started encountering the timeout error, consider the following:

Compatibility: Ensure that the new version of the Microsoft.Graph library is compatible with your application and server environment.

Rollback if Necessary: If complications persist after the upgrade, you may consider rolling back to a previous version that was functioning correctly for you.

3. Confirm Network Connectivity

After adjusting the proxy settings, check your server's network connectivity:

Test Connectivity: Use ping commands or any network diagnostic tools to verify that your server can reach the Microsoft Graph endpoints.

Evaluate Firewall Settings: Ensure that any firewalls in place are not blocking outgoing requests to the Microsoft Graph API.

Why Fiddler Tracing Might Fail

If you experienced difficulties with Fiddler tracing while monitoring calls to the Graph API but not for MSAL authentication calls, changes in the proxy configuration may affect your ability to intercept HTTP traffic. After clearing the proxy settings, you should be able to use Fiddler effectively again to troubleshoot and trace API calls.

Conclusion

In summary, resolving the OAuth2 error in Microsoft Graph on Windows Server typically involves checking and adjusting your proxy configuration. By following the above steps, developers can successfully troubleshoot and solve the WINHTTP_CALLBACK_STATUS_REQUEST_ERROR issue. Should the error persist after these adjustments, further troubleshooting may be necessary to delve into more network-related factors or potential package compatibility issues. Happy coding!

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