I have the same problem, but I don't use any passwords for my database. So what can be the problem?
I'm looking for several weeks but I can't find it.
I used Windows server 2003 web edition en SQL 2005 express

Can somebody help me?

Thanks!

See Error massage:

Error Installing DotNetNuke

Current Assembly Version: 04.00.03

ERROR: Could not connect to database specified in connectionString for SqlDataProviderSystem.Data.SqlClient.SqlException: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText) at DotNetNuke.Data.SqlDataProvider.ExecuteScript(String Script, Boolean UseTransactions) /************************************************************/ /***** Initialization Script *****/ /***** *****/ /***** *****/ /***** Note: To manually execute this script you must *****/ /***** perform a search and replace operation *****/ /***** for dbo. and *****/ /***** *****/ /************************************************************/ if exists etc.

My connectionstring is:

<connectionStrings>
<!-- Connection String for SQL Server 2005 Express -->
<add name="SiteSqlServer" connectionString="Data Source=.\SQLExpress;Integrated Security=True;User Instance=True;AttachDBFilename=|DataDirectory|Pentacrew.mdf;" providerName="System.Data.SqlClient" />
<!-- Connection String for SQL Server 2000/2005
<add
name="SiteSqlServer"
connectionString="Server=(local);Database=DotNetNuke;uid=;pwd=;"
providerName="System.Data.SqlClient" />
-->
</connectionStrings>
<appSettings>
<!-- Connection String for SQL Server 2005 Express - kept for backwards compatability - legacy modules -->
<add key="SiteSqlServer" value="Data Source=.\SQLExpress;Integrated Security=True;User Instance=True;AttachDBFilename=|DataDirectory|Pentacrew.mdf;" />
<!-- Connection String for SQL Server 2000/2005 - kept for backwards compatability - legacy modules
<add key="SiteSqlServer" value="Server=(local);Database=DotNetNuke;uid=;pwd=;"/>
-->

Help me!