How to fix Error 8351 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 8351

Why This Error Happens

Error 8351 occurs when a trace control request—typically issued through Extended Events, SQL Trace, or a third-party monitoring tool—passes invalid or out-of-range parameters during event registration. This is commonly triggered by corrupted trace definition metadata, a mismatched SQL Server version between client tools and the server engine, or malformed GUIDs/channel values supplied by a custom trace session. It can also occur after an incomplete upgrade to SQL Server 2025 where legacy trace providers were not properly re-registered.

Step-by-Step Resolution Guide

Step 1: Verify Active Trace Sessions and Clear Stale Traces

  • Open SQL Server Management Studio (SSMS) and connect to the affected instance.
  • Run the following query to inspect currently active traces:
SELECT * FROM sys.traces;
  • If a corrupted or orphaned trace is found, stop and remove it using:
EXEC sp_trace_setstatus @traceid = <id>, @status = 0;
EXEC sp_trace_setstatus @traceid = <id>, @status = 2;

Step 2: Validate Extended Events Session Configuration

  • Open Object Explorer > Management > Extended Events > Sessions.
  • Right-click the session throwing the error and select Script Session as > CREATE To > New Query Editor Window.
  • Inspect the script for invalid parameter values, especially in ADD EVENT or ADD TARGET clauses (e.g., incorrect max_memory, event_retention_mode, or invalid file path for file targets).
  • Correct any misconfigured values and re-deploy the session using DROP EVENT SESSION followed by CREATE EVENT SESSION.

Step 3: Re-register SQL Server Trace Providers

  • Open an elevated Command Prompt on Windows Server 2025 / Windows 11.
  • Navigate to the SQL Server binaries directory, typically:
C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Binn\
  • Re-register the trace provider DLL (sqlevn70.dll or equivalent) using:
regsvr32 sqlevn70.dll
  • Restart the SQL Server (MSSQLSERVER) service via services.msc to reload provider registrations.

Step 4: Check for Permission Issues on the Service Account

  • Open services.msc and confirm the SQL Server service is running under a valid domain or local service account.
  • Ensure this account has Log on as a service and Perform volume maintenance tasks rights via Local Security Policy > User Rights Assignment.
  • Grant the service account full control on the SQL Server log directory (commonly C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\) to prevent event registration failures caused by access denial.

Step 5: Apply the Latest Cumulative Update

  • Check the currently installed build number by running:
SELECT @@VERSION;
  • Compare against the latest Cumulative Update (CU) for SQL Server 2025 on the Microsoft Update Catalog.
  • Download and install the latest CU, then restart the server to ensure trace-related binaries are patched.

Alternative or Verification Steps

  • After applying fixes, re-run the original trace or Extended Events session and confirm Error 8351 no longer appears in the SQL Server Error Log (ERRORLOG file) or Windows Event Viewer > Applications and Services Logs.
  • If the issue persists, create a brand-new Extended Events session from scratch using the built-in “Quick Start” template in SSMS to rule out corrupted session XML as the root cause.