| Previous | Next |
| WU_E_PT_SOAP_VERSION | WU_E_PT_SOAP_CLIENT |
WU_E_PT_SOAP_MUST_UNDERSTAND
WU_E_PT_SOAP_MUST_UNDERSTAND indicates a SOAP header that the receiving side was required to process but did not recognize. This is a protocol compatibility or message-construction problem.
What to check
- Check recent WSUS, reverse-proxy, or service integration changes that may alter SOAP headers.
- Verify that the client is talking to the intended service version and endpoint.
- Use the request and response logs to identify the unsupported header; the HRESULT alone does not name it.
Microsoft: WUA networking error codes
Microsoft: Windows Update error reference
Looking for a different code? Search another status or error code.