Why "DAC Login Failed, MS SQL 2005 Connection Error." appear when Connecting to MS SQL 2005?

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DAC login is allowed only when client is running through SQL Server. No remote connections are allowed.

To able the remote connections it is compulsory to reconfigure the SQL Server remote connectivity to enable the remote clients to utilize DAC service.

Two ways to configure remote DAC login

  • Configure the Server via SQL Command Mode i.e. sqlcmd by using the following command.

    • sql

  • Use SQL Server Surface Area Configuration. To do this Launch the SQL Server Surface Area Configuration Tool which can be found under following:

    • SQL Server 2005 Configuration Tools in the SQL Server 2005 menus

    Launch the SQL Server Surface Area Configuration.tool which can be found under SQL Server 2005 Configuration Tools in the SQL Server 2005 menus.

     

    image Select "Surface Configuration Area for Features".

     

    image Check the box for "Enable remote DAC".

     

    image Select "Apply".

     

How to enable remote DAC in SQL server 2005/2008 Express ?

 

image Go to "Services" management view and open SQL Server service properties.

 

image Stop the service, set option -T 7806 as shown on the picture below.

 

image Start service from this dialog. It is important now to press Start right from here and now.

 

image Close dialog.

 

sql

 

As a result SQL Server will start with this option which enables DAC login mode. After the server restarted, option disabled.

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