When you encounter a Windows Firewall prompt regarding CefSharp.BrowserSubprocess, the decision to allow or block it depends on your specific use case and security considerations.

1. Functionality Considerations: The CefSharp.BrowserSubprocess is integral for applications that utilize the CefSharp framework, as it enables Chromium browser functionality. If you trust the application that is using CefSharp (like QuickBooks or a similar software), allowing access can help it perform its intended tasks. According to various sources, this prompt appears when the embedded browser attempts to access the network, which is crucial for fetching web content, running updates, or other online functionalities (source).

2. Security Considerations: If you are unsure about the application or if it came from an unknown or suspicious source, it is advisable to block the connection initially. Some discussions suggest that the CefSharp process may raise security alarms when it tries to use the network, prompting users to be cautious, especially regarding its behavior in public networks (source).

3. Network Type: When allowing the application, consider configuring the network type. Many users recommend allowing access only on private networks and blocking it on public networks for enhanced security. This can prevent potential exposure while still enabling functionality on trusted networks (source).

4. Alternatives and Modifications: Some developers have sought ways to eliminate the firewall prompt by modifying settings within the application code, like using the NetworkSecurity flag in the CEF configuration. However, this approach might not always be applicable to end-users without development knowledge and access to the application settings (source).

In conclusion, if you trust the application that uses CefSharp and it is critical for its operation, you may want to allow it through the firewall. If there are any doubts regarding the software’s legitimacy, it is safer to block the subprocess and investigate further. Always ensure that your security software is up to date and monitor the application's behavior after granting access.

Sources

CefSharp.BrowserSubprocess.exe requires Windows Firewall ...Windows defender Firewall sometimes reports CefSharp ... - GitHubCEF Forum • Way to avoid Windows Firewall prompt?cef_subprocess.exe a trojan? : r/WorldOfWarships - RedditCEF Forum • Disable Firewall prompt windowsShould I allow communication on public networks?CefSharp.BrowserSubprocess Issue - QuickBooks - Intuit

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