| Microsoft-Windows-UpdateServices-Server/Operational | 1000 | Info | WSUS service started successfully |
| Microsoft-Windows-UpdateServices-Server/Operational | 1001 | Medium | WSUS service stopped |
| System | 7031 | High | WSUS Service terminated unexpectedly |
| Microsoft-Windows-UpdateServices-Server/Operational | 1200 | Info | WSUS configuration initialized successfully |
| Microsoft-Windows-UpdateServices-Server/Operational | 1201 | Critical | Configuration corrupted or inaccessible |
| Microsoft-Windows-UpdateServices-Server/Operational | 1202 | High | Database connection failed |
| Microsoft-Windows-UpdateServices-Server/Operational | 1300 | Info | Synchronization started |
| Microsoft-Windows-UpdateServices-Server/Operational | 1301 | Info | Synchronization completed successfully |
| Microsoft-Windows-UpdateServices-Server/Operational | 1302 | High | Synchronization failed |
| Microsoft-Windows-UpdateServices-Server/Operational | 1303 | Medium | Sync partially completed (some updates skipped) |
| Microsoft-Windows-UpdateServices-Server/Operational | 1304 | Medium | Update metadata download failed |
| Microsoft-Windows-UpdateServices-Server/Operational | 1305 | Critical | Catalog integrity validation failed |
| Microsoft-Windows-UpdateServices-Server/Operational | 1306 | Info | WSUS subscription settings updated |
| Microsoft-Windows-UpdateServices-Server/Operational | 1400 | Info | Update approved for deployment |
| Microsoft-Windows-UpdateServices-Server/Operational | 1401 | Info | Update declined |
| Microsoft-Windows-UpdateServices-Server/Operational | 1402 | Medium | Update failed to install on clients |
| Microsoft-Windows-UpdateServices-Server/Operational | 1403 | Info | Update superseded or expired |
| Microsoft-Windows-UpdateServices-Server/Operational | 1404 | High | Update file missing or corrupt |
| Microsoft-Windows-UpdateServices-Server/Operational | 1405 | Critical | Update approved by unauthorized account |
| Microsoft-Windows-UpdateServices-Server/Operational | 1500 | Info | Client check-in initiated |
| Microsoft-Windows-UpdateServices-Server/Operational | 1501 | Info | Client status report received |
| Microsoft-Windows-UpdateServices-Server/Operational | 1502 | Medium | Client failed to report status |
| Microsoft-Windows-UpdateServices-Server/Operational | 1503 | Medium | Client version mismatch |
| Microsoft-Windows-UpdateServices-Server/Operational | 1504 | High | Client computer unregistered |
| Microsoft-Windows-UpdateServices-Server/Operational | 1505 | High | Unauthorized client attempted connection |
| Microsoft-Windows-UpdateServices-Server/Operational | 1600 | Info | Database maintenance completed successfully |
| Microsoft-Windows-UpdateServices-Server/Operational | 1601 | Medium | Database cleanup failed |
| Microsoft-Windows-UpdateServices-Server/Operational | 1602 | Medium | High database latency detected |
| Microsoft-Windows-UpdateServices-Server/Operational | 1603 | Critical | Disk space running low on WSUS content folder |
| Microsoft-Windows-UpdateServices-Server/Operational | 1604 | High | WSUS pool memory exceeded threshold |
| Microsoft-Windows-UpdateServices-Server/Operational | 1605 | Medium | IIS connection timeout detected |
| Security | 4624 | Info | Successful WSUS administrative login |
| Security | 4625 | High | Failed WSUS admin login attempt |
| Security | 4719 | High | System audit policy modified |
| Security | 4732 | High | User added to WSUS Administrators group |
| Security | 4733 | Info | User removed from WSUS Administrators group |
| Security | 4738 | Medium | User account modified (WSUS-related access) |
| Microsoft-Windows-UpdateServices-Server/Operational | 1700 | High | WSUS configuration changed |
| Microsoft-Windows-UpdateServices-Server/Operational | 1701 | Info | WSUS configuration rollback performed |
| Microsoft-Windows-WindowsUpdateClient/Operational | 20 | High | Installation failure |
| Microsoft-Windows-WindowsUpdateClient/Operational | 25 | High | Service connectivity issue |
| Microsoft-Windows-WindowsUpdateClient/Operational | 31 | Medium | Reboot required after update |
| Microsoft-Windows-WindowsUpdateClient/Operational | 35 | High | Update metadata download failed |
| Microsoft-Windows-WindowsUpdateClient/Operational | 1001 | Critical | Update detection failed |
| System | 7031 | Critical | Windows Update service terminated unexpectedly |