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Home/ Questions/Q 3237152
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Editorial Team
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Editorial Team
Asked: May 17, 20262026-05-17T17:42:19+00:00 2026-05-17T17:42:19+00:00

I am using SQL EXPRESS EDITION 2005 and Created mdf data file using vb.net

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I am using SQL EXPRESS EDITION 2005 and Created mdf data file using vb.net 2008. now i want to use this datafile in lan. i modified connection string

“Data Source=.\SQLEXPRESS;AttachDbFilename=\Server\Data\Data1.mdf;Integrated Security=True;User Instance=True;Connect Timeout=60”

it is showing security info error i want to use single database file for my application please help me with connection string. thank you

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  1. Editorial Team
    Editorial Team
    2026-05-17T17:42:20+00:00Added an answer on May 17, 2026 at 5:42 pm

    I see two possibilities…

    One, invalid path in your connection string.
    Change your path:
    From: \Server\Data\Data1.mdf
    To: \\Server\Data\Data1.mdf (notice the extra backslash at the beginning)

    Two, your SQL isn’t set up to accept remote connections:

    Open the configuration tools, and then
    click the SQL Server Network
    Configuration, Click Protocols for SQL
    Express. Then enable the Shared Memory
    if not (by default it will be
    enabled), Named Pipes and TCP/IP and
    restart the Server. And ensure that
    your firewall is allowing the remote
    connections to SQL Server.

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