error connecting to SQL Server 2005 from client computer, error locating SQLServer instance or SQLServer does not allow remote connections

  • hi,

    I have installed SQL Server 2005 Express on server running Office 2003 OS. I have a vb.net application running on client computers accessing data from SQLServer located on the server. All was working fine. but now there is a error while opening connection to SQLServer from one of the client computer, error message, "error locating SQLServer instance or SQLServer instance does not allow remote connections".

    I have enabled remote connections in SQL server surface configuration.

    and also the application runs smoothly from all other client computers, there is a connection problem from only one client computers which was also running smoothly previously but suddenly there seems to be a connection problem. The LAN network is working properly.

    What can be the reasons?

  • hi

    are you able to telnet to the SQL server from the client machine successfully on the port specified by you on the server?

    let me know the result

  • hi,

    Thanks for your reply.

    It may sound silly but I have no idea about TelNet

  • on your client PC go to Start -> Run -> CMD

    it should get you to the dos prompt

    next type in the following line below and hit enter:

    telnet yoursqlservername portnumber (ex. telnet testserver 1433)

    let me know what happens when you try this

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