How to Fix SQL Server VIA Support Library

The error indicates an issue with the SQL Server's Virtual Interface Adapter (VIA) support library (QLVipl.dll), which is either missing, corrupted, or improperly configured. Since the VIA protocol is rarely used in modern environments, the simplest fix is often to disable it. Here’s how to resolve the issue:

1. Disable the VIA Protocol:
   • Open SQL Server Configuration Manager.
   • Navigate to SQL Server Network Configuration > Protocols for [Your Instance Name].
   • Locate VIA in the protocol list.
   • Right-click VIA and select Disable.
   • Restart the SQL Server service:
     • Go to SQL Server Services, right-click your SQL Server instance, and select Restart.
2. Verify VIA Protocol in Client Configuration:
   • In SQL Server Configuration Manager, go to SQL Native Client Configuration > Client Protocols.
   • Ensure VIA is disabled here as well.
   • If VIA is enabled, right-click and select Disable.
3. Repair SQL Server Installation (if disabling doesn’t work):
   • Insert the SQL Server installation media or access the setup files.
   • Run the SQL Server Setup.
   • Choose Maintenance > Repair and follow the prompts to repair the installation, which may restore the missing or corrupted QLVipl.dll.
4. Reinstall VIA Support Library (if required):
   • If your environment requires the VIA protocol (rare), reinstall the VIA support library:
     • Download the appropriate VIA driver from your hardware vendor (e.g., QLogic or Emulex).
     • Install the driver and ensure it’s compatible with your SQL Server version.
     • Re-enable the VIA protocol in SQL Server Configuration Manager after installation.
5. Check for System File Corruption:
   • Run the System File Checker to repair corrupted system files:
     • Open Command Prompt as Administrator.
     • Run sfc /scannow and wait for the process to complete.
     • Restart the system if repairs are made.
6. Update SQL Server:
   • Ensure SQL Server is up to date with the latest service packs and cumulative updates, as older versions may have issues with deprecated protocols like VIA.
   • Check Microsoft’s SQL Server update center for the latest patches.
7. Review Error Logs:
   • Check the SQL Server error logs and Windows Event Viewer for additional details about the failure.
   • Look for related errors that might indicate deeper issues with the installation or hardware.

Notes:

• The VIA protocol is typically used in specific SAN (Storage Area Network) environments. If your setup doesn’t rely on VIA, disabling it is the safest and most common fix.
• If the issue persists after these steps, consider contacting Microsoft Support or checking your hardware vendor’s documentation for VIA-specific guidance.