When troubleshooting issues with Outlook add-in or other scenarios where browser logs or HAR files are insufficient, capturing network logs can provide deeper insights. This guide will walk you through the process of capturing network logs using Fiddler, a popular web debugging tool.
What is Fiddler?
Fiddler is a web debugging proxy that logs all HTTP(S) traffic between your computer and the internet. It allows you to inspect traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler is particularly useful for diagnosing issues with web applications, APIs, and network services.
Downloading and Installing Fiddler
- Download Fiddler: Visit the Fiddler website and download the latest version of Fiddler Classic.
- Install Fiddler: Run the installer and follow the on-screen instructions to complete the installation.
Configuring Fiddler
- Launch Fiddler: Open Fiddler from your Start menu or desktop shortcut.
- Configure HTTPS Traffic:
- Go to Tools > Options.
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- In the HTTPS tab, check the box for Capture HTTPS CONNECTs and Decrypt HTTPS traffic.
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- Click OK to save the settings.
- Fiddler will prompt you to install a certificate. Follow the instructions to install and trust the certificate.
3. Configure Fiddler to Capture Traffic:
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- Ensure that File > Capture Traffic is checked.
Capturing Network Logs
- Reproduce the Issue: Perform the actions in your application (e.g., Outlook add-in) that are causing the issue.
- Monitor Traffic: Fiddler will automatically capture all HTTP(S) traffic. You can see the requests and responses in the main window.
- Filter Traffic (Optional):
- Use the Filters tab to narrow down the traffic to specific domains or processes.
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- For example, you can filter by the process name (e.g., OUTLOOK.EXE) to capture only traffic related to Outlook.
Saving and Sharing Logs
- Save the Logs:
- Go to File > Save > All Sessions.
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- Choose a location to save the log file (usually in .saz format).
- Share the Logs:
- Compress the .saz file into a .zip archive.
- Share the .zip file with your support team or the relevant stakeholders.
Frequently Asked Questions
Q1: Why do I need to capture network logs?
A: Network logs provide detailed information about the HTTP(S) traffic between your application and the server. This can help diagnose issues that are not visible in browser logs or HAR files.
Q2: Can I use Fiddler to capture traffic from mobile devices?
A: Yes, Fiddler can capture traffic from mobile devices. You need to configure your mobile device to use Fiddler as a proxy. Detailed instructions can be found in the Fiddler documentation.
Q3: Is it safe to decrypt HTTPS traffic with Fiddler?
A: Decrypting HTTPS traffic with Fiddler is generally safe for debugging purposes. However, ensure that you only do this in a secure environment and remove the Fiddler certificate after debugging.
Q4: What if Fiddler is not capturing any traffic?
A: Ensure that Fiddler is set to capture traffic (check File > Capture Traffic). Also, verify that your browser or application is configured to use Fiddler as a proxy.
Q5: Can I use Fiddler on macOS or Linux?
A: Fiddler Classic is only available for Windows. However, you can use Fiddler Everywhere, which is cross-platform and works on Windows, macOS, and Linux.
Q6: How do I stop Fiddler from capturing traffic?
A: Simply uncheck File > Capture Traffic or close Fiddler.
Q7: What should I do if I encounter an error while installing the Fiddler certificate?
A: Ensure that you have administrative privileges on your machine. If the issue persists, consult the Fiddler documentation or contact your IT support team.
By following this guide, you should be able to capture and share network logs effectively, aiding in the resolution of issues with Outlook add-in or other network-related problems. If you have any further questions, feel free to reach out to your support team.