What does HRESULT 0x800C000D (INET_E_UNKNOWN_PROTOCOL) mean?

Status / error code:

Category:

Constant name:

Source:

Facility:

Operating System:

Description:

INET_E_UNKNOWN_PROTOCOL means the URL or binding operation uses an Internet protocol scheme that the current Windows URL handler does not recognize.

Previous	Next
INET_E_INVALID_REQUEST	INET_E_SECURITY_PROBLEM

INET_E_UNKNOWN_PROTOCOL

INET_E_UNKNOWN_PROTOCOL is a URL Moniker HRESULT. It means that no protocol handler recognized the URL scheme or the requested scheme is not supported in the current Windows configuration.

Diagnostic discriminator: Compare the failing URL with one using a scheme that the same process handles successfully. If only the scheme changes the result, inspect the final runtime URL and protocol-handler registration rather than DNS or server health. A retry with the same unrecognized scheme cannot succeed until the handler or URL scheme is corrected.

What to check for INET_E_UNKNOWN_PROTOCOL

Validate the URL scheme and make sure it is spelled correctly and registered for the intended handler.
Use a protocol supported by the application and its deployment environment.
Investigate handler registration or policy restrictions if a normally supported scheme is unavailable.

Microsoft documentation

Looking for a different code? Search another status or error code.