How to fix Error 2559 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 2559

Why This Error Happens

Error 2559 occurs when a T-SQL statement contains two mutually exclusive options that SQL Server 2025’s parser cannot reconcile within the same command — commonly seen with conflicting BACKUP/RESTORE options (e.g., STATS combined with CONTINUE_AFTER_ERROR in unsupported ways) or conflicting WITH clause arguments. This is typically caused by legacy scripts, migrated maintenance plans, or third-party backup tools generating syntax that was deprecated or restructured in newer SQL Server builds. It is a syntax-validation error rather than a permissions or connectivity issue, meaning the server rejects the statement before execution begins.

Step-by-Step Resolution Guide

Step 1: Identify the Conflicting Statement

  • Check the SQL Server error log at C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\ERRORLOG for the full statement text referenced by Error 2559.
  • Look for the two placeholder values (%ls and %ls) in the Windows Event Viewer under Applications and Services Logs > MSSQLSERVER to identify exactly which options were flagged.

Step 2: Review and Correct the T-SQL Syntax

  • Open the offending script in SQL Server Management Studio (SSMS) 21 and locate the WITH clause.
  • Remove one of the conflicting options — common pairs include DIFFERENTIAL with COPY_ONLY, or FORMAT with NOINIT.
  • Re-run the statement in isolation using SET PARSEONLY ON; to validate syntax without executing it.

Step 3: Update Maintenance Plans and Automation Scripts

  • Open SQL Server Agent > Jobs and inspect any job steps referencing backup/restore commands.
  • Edit scheduled maintenance plans in SSMS > Management > Maintenance Plans to remove deprecated option pairings.
  • If using third-party backup software (e.g., Veeam, Redgate), update to the latest version compatible with SQL Server 2025 build numbers.

Step 4: Apply the Latest Cumulative Update

  • Confirm your current build via SELECT @@VERSION;.
  • Download and install the latest Cumulative Update (CU) for SQL Server 2025 from the Microsoft Update Catalog, as some parser edge cases are patched in CUs.
  • Restart the SQL Server (MSSQLSERVER) service via services.msc after installation.

Alternative or Verification Steps

  • Re-execute the corrected statement directly in SSMS and confirm it completes without Error 2559 appearing in the Messages tab.
  • If the error persists, run DBCC TRACEON(3604, -1) and re-attempt the statement to get verbose parser output, then cross-reference the exact option names against the current T-SQL BACKUP/RESTORE documentation for SQL Server 2025 syntax changes.