The resources below contain definitions for various error codes that might be seen with Windows Update.
Individual official MS sources
- WUA Success and Error Codes
- WUA Networking Error Codes
- Windows Server Update Services 3.0 SP1 Operations Guide Appendix G: Windows Update Agent Result Codes
- Microsoft Agent Error Codes
- COM Error Codes (Security and Setup)
- Windows Update error code list
- WinINet Error Messages
- WinHTTP Error Messages
- System Error Codes