Unable to connect to SQL Server 2008 Express from NT4 client


  • I have a client running a manufacturing system which uses a very old controller running NT4.

    The controller connects to a MSSQL database and also uses flatfile scripts.  Previously it was successfully connected to MSSQL Server 2008 R2 Express running on a Server 2003 platform.

    The old server must be retired, and we deployed a new Server 2008 R2 x64 platform, which has the same MSSQL Server 2008 R2 Express instance on it.  Other systems can successfully connect to the database on the new server.  The NT 4 box can see the server name and instance name via SQL Browser, but attempts to connect to the database using a UDL connection yield the following error:

    [DBNETLIB][ConnectionOpen (SECDoClientHandshake()).]SSL Security error.

    The NT 4 box can still connect to the old server 2003 and its MSSQL2008 Express instance successfully.

    I upgraded the Data Access Components on the NT4 box to MDAC 2.8 SP1 in hope that the updated DBNETLIB.dll would solve the issue.  MDAC 2.8 SP1 appears to be the latest possible version for NT4.  I'm well aware that NT4 is long EOL for support purposes, but replacing the controller on this piece of equipment is a very expensive proposition.  If there is any way we can milk the old box for a few more months the owner would like to do so.

    The software on the controller uses a UDL connection and so I am using a UDL file for testing - as I said, I get a successful connection to the old database on the Server 2003 box.

    I'd be grateful for any insight.

    Monday, November 18, 2013 4:42 PM

All replies

  • Hello,

    I found a similar problem except that it is concerning a SQL Server 2000

    A little question ( I hope you will excuse me but I am not sure to have understood fully your question because of my poor understanding of the English language ) : is your SQL Server 2008 R2 Express installed on a Windows Server 2008 R2 ( but which last installed service pack ? ) ?

    Which is the last installed service pack for your SQL Server Express 2008 R2 ?

    In , I have read "Note that this redistributable version should only be installed on Windows 2000. It should not be installed on any later versions of the data access components."

    The document is concerning Windows XP , Windows 2000 and Windows Server 2003. Nothing found related to Windows NT4 , and I am fearing possible problems with NT4.

    Have a nice day 

    PS : I would suggest to have a look at :

    It seems that the MDAC version supported by Windows NT4 is MDAC 2.0 SP1

    Mark Post as helpful if it provides any help.Otherwise,leave it as it is.

    Monday, November 18, 2013 10:54 PM
  • I'm experiencing the same issue with SQL Server 2014. Did you found any solution at the time...?

    Best Regards,


    Thursday, September 08, 2016 11:00 AM