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ERROR_FORMS_AUTH_REQUIRED
Interactive web authentication is required
ERROR_FORMS_AUTH_REQUIRED is a Win32 result associated with WebDAV or document access backed by forms authentication.
What the result means
The remote location requires an interactive forms-based sign-in before file access can continue.
What to check
- Open the service in an interactive browser and complete the required sign-in.
- Confirm that the site is trusted according to the organization’s policy.
- Check whether the application supports modern authentication instead of relying on browser session state.
- Avoid embedding user passwords in scripts or command lines.
Recommended handling
For unattended software, use a supported token or service authentication flow. A background process generally cannot satisfy an interactive forms challenge reliably.
References
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