How to fix Error 5313 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 5313 — Synonym Refers to an Invalid Object

Why This Error Happens

This error occurs when a synonym object in SQL Server points to a base object (table, view, stored procedure, or function) that no longer exists, has been renamed, or resides in a schema/database the current user cannot access. It is commonly triggered after a deployment, migration, or refactoring process drops or renames the underlying object without updating or dropping the dependent synonym. Additionally, this can happen if the target object exists on a linked server that is unreachable, or if the executing login lacks the necessary permissions (SELECT, EXECUTE, or REFERENCES) on the base object itself.

Step-by-Step Resolution Guide

Step 1: Identify the Synonym and Its Target

  • Open SQL Server Management Studio (SSMS) and connect to the affected instance on your Windows Server 2025/Windows 11 machine.
  • Run the following query to locate the synonym definition and its intended base object:
SELECT name, base_object_name, schema_id 
FROM sys.synonyms 
WHERE name = 'YourSynonymName';
  • Note the exact three or four-part name returned in base_object_name (e.g., ServerName.DatabaseName.SchemaName.ObjectName).

Step 2: Verify the Base Object Exists

  • Query sys.objects in the target database to confirm the base object is actually present and spelled correctly:
SELECT * FROM sys.objects WHERE name = 'BaseObjectName';
  • If the object was renamed or dropped during a recent release, check the deployment scripts or Default Trace / Extended Events logs for DROP or ALTER statements executed around the error timestamp.
  • If the base object sits on a linked server, verify connectivity using sp_testlinkedserver 'LinkedServerName'; and confirm the remote server is online and reachable over the network (check firewall rules on Windows Server 2025).

Step 3: Correct Permissions on the Base Object

  • Ensure the login/user executing the synonym call has explicit permissions on the underlying object, since permission checks in synonyms do not inherit automatically in all contexts:
GRANT SELECT ON dbo.BaseObjectName TO [YourUserOrRole];
  • For stored procedures or functions referenced by the synonym, grant EXECUTE instead of SELECT.

Step 4: Recreate the Synonym with the Correct Reference

  • If the base object was renamed or moved, drop and recreate the synonym pointing to the new valid path:
DROP SYNONYM dbo.YourSynonymName;
GO
CREATE SYNONYM dbo.YourSynonymName 
FOR DatabaseName.SchemaName.NewObjectName;
GO
  • Double-check case sensitivity and schema qualification, especially if the database collation is case-sensitive.

Alternative or Verification Steps

  • Re-run the query or application call that originally triggered Error 5313; a successful result set or execution with no 5313 error confirms the synonym now resolves correctly.
  • As an alternative, audit all synonyms in the database at once using SELECT * FROM sys.synonyms cross-referenced against sys.objects to catch any other orphaned synonyms before they cause production errors.