How to fix Error 7813 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 7813 – “Parameter PATH Must Be Supplied in Its Canonical Form”

Why This Error Happens

This error occurs when SQL Server receives a file or directory path that contains relative references (such as ..\), forward slashes, environment variables, or improperly formatted drive letters instead of a fully qualified, absolute path. SQL Server’s path validation engine strictly requires canonical paths—meaning a clean, absolute reference like C:\Data\MyFile.mdf—for operations like CREATE DATABASE, RESTORE, BACKUP, or FILESTREAM configurations. This commonly surfaces after migrating scripts from Linux-based SQL Server instances or when automated deployment tools inject malformed UNC paths.

Step-by-Step Resolution Guide

Step 1: Identify the Offending Command or Script

  • Review the exact T-SQL statement that triggered Error 7813 (check SQL Server Error Log or Activity Monitor).
  • Look specifically at CREATE DATABASE, ALTER DATABASE, BACKUP DATABASE, or RESTORE DATABASE statements.
  • Pay attention to the %.*ls placeholder in the error message—SQL Server usually echoes back the problematic path in a follow-up message.

Step 2: Correct the Path Syntax

  • Replace any forward slashes (/) with backslashes (\) since Windows Server 2025 requires native Windows path delimiters.
  • Remove relative path indicators such as .\ or ..\; use the full absolute path instead (e.g., D:\SQLData\MyDB.mdf instead of ..\SQLData\MyDB.mdf).
  • If using UNC paths for network shares, ensure the format is exactly \\ServerName\ShareName\Folder\File.mdf with no trailing slashes or malformed segments.
  • Avoid embedding environment variables (like %ProgramFiles%) directly in T-SQL path strings—SQL Server does not expand these at runtime.

Step 3: Validate Folder Permissions and Existence

  • Confirm the target directory physically exists on the Windows Server 2025 host using File Explorer or dir in Command Prompt.
  • Grant the SQL Server service account (e.g., NT Service\MSSQLSERVER) Modify permissions on the target folder via Right-click Folder > Properties > Security > Edit.
  • Restart the SQL Server service if permissions were just applied: run net stop MSSQLSERVER followed by net start MSSQLSERVER in an elevated PowerShell session.

Step 4: Re-run the Query with the Canonical Path

  • Execute the corrected CREATE DATABASE or RESTORE statement in SQL Server Management Studio (SSMS) 21 or Azure Data Studio.
  • Example of a canonical, accepted path format:
  CREATE DATABASE TestDB
  ON (NAME = TestDB_Data, FILENAME = 'C:\SQLData\TestDB.mdf')
  LOG ON (NAME = TestDB_Log, FILENAME = 'C:\SQLLogs\TestDB_log.ldf');
  • Confirm no red error banners appear in the SSMS “Messages” tab after execution.

Alternative or Verification Steps

  • Run SELECT physical_name FROM sys.master_files; after the fix to confirm SQL Server registered the absolute path correctly without truncation or malformed slashes.
  • If the error persists with UNC paths, test connectivity independently using Test-Path "\\ServerName\ShareName" in PowerShell to rule out network or DNS resolution issues before blaming SQL Server itself.