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WU_E_PT_INVALID_URL
WU_E_PT_INVALID_URL identifies the URL itself as invalid for the Windows Update protocol operation. It is not an HTTP status returned by a server: URL parsing or validation fails before a normal request/response exchange can be relied on.
Validate the configured service URL as a URI
RFC 3986 defines the generic URI components used to parse a scheme, authority, path, query, and fragment. For a managed Windows Update client, preserve the exact service URL before normalizing it in logs. A missing scheme, malformed authority, accidental whitespace, or incorrectly escaped value can be hidden by a logging layer that “cleans up” the string.
- Compare the configured Windows Update or WSUS service location with the value on a working client.
- Check policy generation and registry-writing code for truncation or double escaping.
- Do not troubleshoot HTTP authorization until the client can construct a valid target URL.
Why redirects are a separate problem
An invalid URL is rejected as a URL. A valid URL that reaches a server and is redirected, forbidden, or unavailable proceeds far enough to produce different protocol-talk or HTTP-status results. Keeping those boundaries separate avoids replacing certificates and proxy credentials for a malformed endpoint string.
References
- RFC 3986: Uniform Resource Identifier syntax
- Microsoft: configure the WSUS service location
- Microsoft: Windows Update error reference
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