SQL Server :: Error: 40 - Could Not Open A Connection To SQL Server?
Feb 18, 2011
I am facing a strange problem .can't figure this out.my web site's all pages are running fine except home page.i got this error
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider,error: 40 - Could not open a connection to SQL Server)
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Nov 23, 2010
I just installed sql server 2008 R2 on my computer. I am trying to connect to sql server throught my C# code and everytime I run the C# program,
I get this error "A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) "
The connection string that I used in my web.config file is
[Code]....
I am not sure what am I doing wrong, but I followed this article below step by step and still I am getting the same error
http://blog.sqlauthority.com/2009/05/21/sql-server-fix-error-provider-named-pipes-provider-error-40-could-not-open-a-connection-to-sql-server-microsoft-sql-server-error/
My instance name is MSSQLSERVER and the server that I am using is on my local machine and it has my computer name in it.
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Jan 8, 2010
I have an application with a few dbml files to connect to several sql servers in order to import data from one to another using Linq to SQL.
There are 2 connection strings with integrated security and in one I provide user ID and password.
It all works great in the development workstation. I've then wrapped the dll project and deployed the asp.net application to a test server. Then, when I tried to run the application to import the data, I got a connection exception:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
I figured out after some debugging the problem is with the DataContext whose connection string is the one I provide user ID and password. Now, the funny part is that the same connection string works if I create a udl file and test it. And again the same connection string works with my development workstation.
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Sep 23, 2010
I've created a small website with a simple sqlite database using vwd 2010 .net 4. In dev and test envionments everything works fine, however when i promote to my hosting provider i receive the following error:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.
(provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
I've been configuring the connection strings (autogenerated from entity framework and attached db) but unable to get it working on the hosting provider, I'm assuming it's related to permissions but not entirely sure how to resolve - here's the web.config as it stands:
<add
name="ApplicationServices"
connectionString="data [code].....
For info the environments are set up as follows:
- Dev environment is vwd express 2010 with sqlite mdf attached
- Test environment is windows 7 server, iis 7 with appdomain identity set to network service
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Mar 25, 2011
I have developed Dynamic Data application for DB administration. I'd like to show thrown exception message (when connection to db is closed) in UI friendly manner. I cant figure out where to catch this exception.
Tried EntityDataSource events in List PageTemplate - no success.
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Sep 13, 2010
I'm using Visual Studio 2008, and my database is SQL Server 2000.
I want to add a connection to the Server Explorer in VS. The Data source is Microsoft SQL Server (SqlClient). After entering in all my information and I click Test Connection, it is successful.
But when I click OK, I get the error:
Unable to add data connection. ExecuteScalar requires an open and available connection. The connection's current state is closed.
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Mar 5, 2010
Not sure why it works if i connect to SQL 2005 on another server, but now that i have SQL Express on the same server as the pages, im getting the following error: I have attached my connection string within my web.config and also how its being called within the code behind. Now this page was written by another programmer some time back.. so not sure if the method he used to do this is the best or only way. But i have connected to other SQL database with other applications with alot less code.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.
(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Source Error: Line 131:
Line 132: //connect to this sql server
Line 133: c.Open(); -----> this is the line it complains about.[Code]....
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Jan 25, 2011
I published my web.The problem is that the path to the DataBase is not good and i dont know how to change it.heare is the error:A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
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Aug 31, 2010
I have problems connecting to my database server. The database server is not local, I am connected via its IP address. It works fine in my development machine. After publishing the website to my server, it can not connect to my database server. A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)Why can't my publish server connect to the database server, whereas it works fine through the development machine?
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Sep 2, 2010
This is regarding ASP.Net (VB) 2.0 and SQL Server 2008. My project's (there is only one in my solution) has a "Start Action" set to a "Specific Page" (..FormsfrmMain.aspx). Occasionally (though not always) a large number of connections (30+) will be opened prior to the frmMain.PreInit event. These connections stay open for quite some time. I am closing all of my connections with extreme prejudice. In my "finally" clause of my try...catch I have myconnection.close. Immediately after the "End Try" I have myconnection.dispose (redundant, I know). I have accounted for all connections. I placed a breakpoint on frmMain.PreInit and then (sometimes) a large number of connections (used SSMS to run sp_who and sp_who2) will have just opened.What would open a large number of connections prior to the starting page's preinit event? I am closing (and then disposing) all of my connections. I thought that I must be missing a myconnection.close in the "finally" clause, but I have looked repeatedly and cannot find anywhere that a connection is open and then not closed. Also, I do not believe that I have even opened a connection prior to the frmMain's preinit event.
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Oct 20, 2010
I devlopyed on asp.net application in IIS, i need to know how many current database connection is open for the database..
so how can i check how many connection are currently using for this database... if we dont want some connection how can we kill the connection
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Sep 30, 2010
I have VS 2010 professional. I am trying to open "ASP.Net Configuration" through Project -> ASP.Net Configuration.
It pops up the Notification about the ASP.Net Development Server localhost but doesn't open ASP.Net Configuration in the default browser.I clicked on the Root Url (by double clicking on the 'development server' at the right bottom from Notification Manager).
It throws following error
"An error was encountered. Please return to the previous page and try again."
Clicking on "How do i use this tool".It opened page with error.
Tool Has Timed Out
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Oct 5, 2010
I was wondering about something. I'm supporting a .NET C# application which has a number of database connections declared locally as IDbConnection with MS SQL Server and NHibernate. These connections are declared locally and not explicitly closed after a specific operation is performed. Are these connections automatically closed after the local method is executed, or could these connections be floating around somewhere? We're having semaphore max out problems, and I'm trying to see if this may be the culprit. I'm doubtful, as I believe these connections would automatically close, but thought I'd throw out hte possibility.
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Jun 5, 2010
I previously used a datasource and a connection string to connect to my database on sql server and all orked fine. The connection string was saved in my web.config file and is: ....
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Sep 8, 2010
I am trying to create a simple login page in ASP.NET C# but am getting some error.
I googled about the error, and tried all the solutions but to no avail.What am I doing wrong? The error is:
"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)"
I think it's something to do with my connection string which is as follows:
<add name="cn"
connectionString="server=HCL;DataBase=GS;Integrated Security=True" />
"HCL" is another machine connected to my PC through the LAN and this database, "GS", resides on it. Is the problem with the value I am giving in "Server" attribute of the above code? If not what else may I be doing wrong?
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Apr 22, 2010
Following is the error I am getting while accessing some of the pages on my website.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections.
(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
It is trowing an exception and giving the about mentioned error.
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Feb 28, 2010
i get error A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - No connection could be made because the target machine actively refused it.)
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Oct 7, 2010
I was able to publish a web application with many projects inside it and which connects to oracle databasenow, I put it on remorte IIS 2003 server but it gave this error that has to do with aspnetdb fileA network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)and then I tried it on my local windows7 IIS local host and I got this error Failed to generate a user instance of SQL Server due to failure in retrieving the user's local application data path. Please make sure the user has a local user profile on the computer. The connection will be closed.
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Oct 13, 2010
Everything was working fine yesterday afternoon before going home.. shut down with no issues and this morning when i try to open SQL i get error message with the following, im on a deadline with this project and cant afford to lose what i have setup already. Is there anything i can do to correct whatever issues there may be?
TITLE: Connect to Server
------------------------------
Cannot connect to local.
------------------------------
ADDITIONAL INFORMATION:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)
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Aug 13, 2010
This issues has been driving me nuts. I am trying to follow the tutorial on [URL] I am trying to connect to a database in Microsoft SQL Server 2008. The way I do this is by right clicking on the "Data Connections" > Add Connection. Afterwards the Add Connection window comes up, I make sure my data source is "Microsoft SQL Server (SqlClient). And, I choose a server name; the only server I can choose is DomainSQLEXPRESS. The issue is when I go down to the "Select or enter a database name" drop down box, I do not see my database listed. I have also made sure in the SQL Server Management Studio that I have given my user all the privileges for the database. I know my explanation is kind of vague, but would anyone know the reason why I would not see my database?
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Jan 10, 2011
Not sure what's going on with this procedure, im kind of new at dynamic DB programming. As of right now if i click a button that triggers the execution of this stored procedure the page says the connection has been timed out..despite other stored procedures working flawlessly.
[code]....
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Aug 9, 2010
I have an asp.net web page which works with a database. When I first upload it I never disposed the connections so after using the different modules of the application for sometime it would suddenly stop working saying the connection pool filled or something like that.To fix it when a user clicked a button I opened the connection, tell the database what I needed and finally disposed the connection.
This seemed to fix everything, in fact you can work with application all you want, the problem comes if you stop using it for certain time.So for instance, I have a module in my webpage where user can capture information for a certain product. When the user clicks in one button the info gets into the database. If the user is continuosly capturing data everything works fine, but if it goes for about 10 min when he clicks the button he will receive an error. To fix this the user has to log-in again.
Every module opens a connection to the database to verify the user identity, but then after it verifies it I dispose the connection so I don't think there is a problem.
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Feb 17, 2011
I deployed my MVC app to IIS 7.0 and I keep getting the following error; ExecuteNonQuery requires an open and available Connection. The connection's current state is closed I dont get this with the app locally on my machine. Where could this error be occurring??
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Oct 16, 2010
I installed windows 7 recently & I am new to ASP.NET. I installed visual studio 2008 for developing ASP.NET application. I created my web application on visual web developer 2008 & when I run my aplication, ASP.NET development server runs & my defualt browser opens automatically but it cannot show my web page. Connection error ocurrs. But when I open this web page with visual studio's internal browser, it works fine for me. So tell me whats the problem with my default browser(IE8, Flock2.6), Any configuration setting or what, I don't know exactly.
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Sep 5, 2010
I am having problem when i was trying to attach .mdf file while create a new connection of SQL server, create a new connection of SQL database file and open the database in Server Explorer. I am using VS 2010 Ultimate and SQL Express 2008 R2.
Here are the error message.
1. Attach .mdf in SQL database file and open the database in Server Explorer
2. Create a new SQL server and attach .mdf
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