Error Code 0x80040871 Summary
The error code 0x80040871 typically indicates an issue with Microsoft Office or Outlook, specifically related to the Exchange Web Services (EWS) API. This error generally occurs when a client application attempts to communicate with an Exchange server but encounters an authentication problem, often due to incorrect credentials, permissions issues, or problems with the connection between the client and the server. It can also arise if there is a misconfiguration in the Office 365 settings related to EWS. To troubleshoot this issue effectively, you should review your network configuration, ensure that your account has sufficient access rights on the Exchange server, verify any recent changes made to the system’s security or software configurations, and check for outdated or conflicting add-ins that could interfere with proper authentication processes.
Where You Might Encounter Error Code 0x80040871: Common Scenarios and Solutions
This error can occur in various contexts where an application relies on communication between a client (such as Outlook) and a Microsoft Exchange Server via EWS. It often appears when attempting to connect to Office 365 services from applications developed using the EWS Managed API or the .NET Framework libraries for working with Exchange. Additionally, it can arise during synchronization processes in desktop clients such as Outlook and Outlook Web App (OWA). The error is particularly common when users try to access resources they do not have permission to use or when there are issues with their authentication tokens or session keys used for EWS connections. It may also manifest if the user’s credentials have expired, if multi-factor authentication settings prevent successful logins from some applications, or if firewall rules and network policies block necessary traffic between the client machine and the Exchange server.
Howto solve error code 0x80040871
To resolve the error 0x80040871, follow these detailed steps:
- Ensure that your credentials are correct by logging into Outlook Web Access (OWA) using the same account to confirm you can access Exchange services.
- Check if multi-factor authentication is enabled and properly configured for the application trying to connect; disable it temporarily or use an app password as a workaround.
- Verify that no firewall rules are blocking communication between your client machine and the Exchange server on necessary ports (e.g., TCP 443).
- Clear any cached credentials stored in Windows Credential Manager for your Exchange account to ensure you’re not using outdated or incorrect login information.
- If you have Office 365, make sure that your user account has sufficient permissions within the organization; check with your administrator if necessary.
- Review all recent changes made to your system’s security settings or software configurations which might interfere with EWS operations.
- Disable any third-party add-ins in Outlook and test whether they cause conflicts by restarting Outlook without them installed.
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