Saturday, 7 May 2011

"Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed."

After my fun with trying to get VS, SQL and Phone Tools all working together, I had the following error trying to mount databases:

"Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed."

If you get that error message, the solution that worked for me was to clear the SQL Express user instance data store, located at:

%userprofile%\AppData\Local\Microsoft\Microsoft SQL Server Data\SQLEXPRESS
(or full path)

C:\Users\\AppData\Local\Microsoft\Microsoft SQL Server Data\SQLEXPRESS

Hope this helps someone!

38 comments:

  1. Unknown19 August 2011 at 06:52

    thank you that's work for me

    ReplyDelete
  2. Anonymous8 September 2011 at 03:46

    HI I like to share what I found.
    I tried what you and many of them said but I couldn't get it done properly. I worked with the .mdf database file not connect with the SQL Server so all I have done change the
    connection string to this

    @"Data Source=.;AttachDbFilename=" + Server.MapPath("~/DATABASE_NAME") + @";Integrated Security=True;Connect Timeout=30;User Instance=True";

    instead
    .\SQLEXPRESS
    I used this
    .
    then it worked. also it can be done with Server Explorer-> Add New Connection-> Select SQL Database File or something then go to Advance and replace .\SQLEXPRESS with . that's all.

    if someone has any trouble regarding this so this might be the solution for you if non of things worked.

    ReplyDelete
    Replies
    1. Ronny Kvist18 July 2012 at 21:42

      Thanks, works like a charm....

      Delete
    2. Anonymous6 November 2012 at 12:43

      still i can not create database. what can i do?

      Delete
  3. Anonymous14 December 2011 at 22:37

    Thanks, It was really helpful...

    ReplyDelete
  4. Anonymous26 December 2011 at 14:33

    Thanks. It worked just fine

    ReplyDelete
  5. Anonymous26 December 2011 at 14:33

    Thanks. It worked just fine

    ReplyDelete
  6. Anonymous31 December 2011 at 09:54

    Superb, that simple suggestion worked first time, all of the complicated ones from elsewhere didn't.

    Thank yoy.

    ReplyDelete
  7. Anonymous24 January 2012 at 20:35

    Thanks !your suggestion worked..

    ReplyDelete
  8. juni8 February 2012 at 16:18

    worked. thanks! :)
    but.. what did it do?

    ReplyDelete
  9. Anonymous28 February 2012 at 13:16

    thank u boss

    ReplyDelete
  10. Anonymous1 March 2012 at 08:01

    thank a lot

    ReplyDelete
  11. Anonymous5 March 2012 at 19:08

    thank you very much!
    it worked fine

    ReplyDelete
  12. Anonymous28 March 2012 at 08:02

    Appdata doesn't appear

    ReplyDelete
  13. Anonymous10 April 2012 at 23:35

    you da maan

    ReplyDelete
  14. Anonymous23 April 2012 at 08:28

    Wont let me modify it

    ReplyDelete
  15. Anonymous4 May 2012 at 21:36

    Worked fine for me. Thanks

    ReplyDelete
  16. Anonymous30 May 2012 at 17:06

    Worked well thnx

    ReplyDelete
  17. Gustavo14 June 2012 at 06:56

    Worked for me!! THX

    ReplyDelete
  18. Unknown29 June 2012 at 13:21

    Thank you very much...

    ReplyDelete
  19. Anonymous9 July 2012 at 11:17

    Gryphes, I did what you have told,but its showing the following error,

    "A network related or instance-specific error occured while establishing the connection to the SQL Server...."

    What shall I do now?

    ReplyDelete
  20. Anonymous9 July 2012 at 11:17

    William what shall be the full path for Windows XP?

    ReplyDelete
  21. Anonymous31 August 2012 at 17:38

    thank you very much... it worked:)

    ReplyDelete
  22. Anonymous29 September 2012 at 13:32

    it works!
    Thanks

    ReplyDelete
  23. Dan20 November 2012 at 15:23

    Worked for me! Thanks a lot! =)

    ReplyDelete
  24. unpeudetoutmontreal13 April 2013 at 19:56

    thank you it works !!

    ReplyDelete
  25. Anonymous12 August 2013 at 08:41

    Nice, thanks it worked.

    ReplyDelete
  26. Unknown22 December 2013 at 20:30

    thanks it helped for me

    ReplyDelete
  27. Khushbu Patel23 February 2014 at 12:05

    Can you anybody tell me how to create database in vs 2010 project inbuilt ?

    ReplyDelete
  28. Khushbu Patel23 February 2014 at 12:09

    How to create .mdf database in vs 2010 ?

    ReplyDelete
  29. Maulik Prajapati26 March 2014 at 06:19

    Thanks, It's Work successfully........

    ReplyDelete
  30. Anonymous28 May 2014 at 05:16

    worked, thanks!!

    ReplyDelete
  31. Anonymous7 April 2015 at 06:22

    its not working for me
    ....i have deleted the contents...bt still it is not working

    ReplyDelete
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