Are you receiving a Microsoft SQL error 18452 while connecting to the database?

Incorrect authentication mode commonly causes this error.

Here at Bobcares, we routinely resolve SQL errors such as this as part of our Server Management Services.

Today we’ll cover the most effective fix and alternate solutions for Microsoft SQL error 18452.


What leads to Microsoft SQL error 18452?

SQL Server supports two authentication modes:

Windows authentication is the default mode. Specific Windows user and group accounts are trusted to log in to SQL Server.

Mixed-mode supports authentication by both Windows and SQL Server. SQL server maintains the User name and password pairs.

As Windows authentication mode is the default authentication mode enabled after installing the Microsoft SQL Server, users may face issues while connecting to the server.

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How to fix Microsoft SQL error 18452?

Switching to the Mixed-mode authentication can fix the Microsoft SQL error 18452.  This can be done easily with the steps below:

  • From Start >> click All Programs >> click Microsoft SQL Server 20xx (where xx is the version of SQL)>>and then click SQL Server Management Studio.
  • In the SQL Server Management Studio, right-click the server, and then click Properties.


Microsoft SQL error 18452


  • On the Security page, under Server authentication, click the SQL Server and Windows Authentication
    mode option button, and then click OK.


  Microsoft SQL error 18452


  • In the SQL Server Management Studio dialog box, click OK to restart SQL Server.


Alternative Fixes

At times, this error occurs when users try to connect by using SQL Server Authentication but the login used does not exist on SQL Server
To resolve this issue, verify that the SQL Server login exists.

Also, this error can occur if the login may use Windows Authentication but the login is an unrecognized Windows principal. An unrecognized Windows principal means that Windows can’t verify the login. This might be because the Windows login is from an untrusted domain. To resolve this issue, verify that you are logged in to the correct domain.


[Need help to fix Microsoft SQL error 18452? We are available 24×7]


In short, the common cause for SQL error 18452 is the Windows authentication mode. Today, we discussed how our support engineers fix this error easily.

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