What is Error 11001?
Windows System Error Code 11001, known as WSAHOST_NOT_FOUND, is a Cluster & Storage error that occurs during cluster, backup, and storage management. The error indicates that: No such host is known. When this error is encountered, the Windows operating system was unable to complete the requested operation within the storage/cluster services subsystem. The error code 11001 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name WSAHOST_NOT_FOUND maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within cluster, backup, and storage management is essential for effective troubleshooting.
Common Causes
- System resource conflict: No such host is known.
- Quorum lost due to node failure
- Storage paths disconnected
- Cluster service dependency failure
Troubleshooting COM and DCOM Architectural Failures (Event ID 10016)
A comprehensive guide on Component Object Model (COM), Distributed COM (DCOM), and how to safely interpret and resolve Event ID 10016 errors.
Read the full guide →Step-by-Step Solutions
- Open PowerShell as Administrator
- Run: Get-ClusterNode to check node status
- Run: Test-Cluster for full validation
- Review the HTML report for issues
Video Tutorials
Diagnostic Command
Run this PowerShell command to find related events in your system log:
Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*11001*" -or $_.Message -like "*WSAHOST_NOT_FOUND*"} | Format-List💡 Open PowerShell as Administrator, paste the command above, and press Enter.
Prevention Tips
- Configure redundant storage paths (MPIO)
- Validate cluster after updates
- Monitor disk latency and capacity