I'm trying to connect to a SQL Server 2008 R2 Express database using a Linq DataContext. The database engine is running on another machine in the local network. We are using SQL authentication, for the time being. SQL Server is set up to allow remote connections.
My connection string looks like this, and works fine. I haven't specified the instance, but it's the only one, so I guess it is chosen by default:
Data Source=192.168.1.50;Initial Catalog=DbName;User ID=SomeUser;Password=SecretPassword;
I've installed the same engine locally too, and this connection string works too:
Data Source=localhost;Initial Catalog=DbName;User ID=SomeUser;Password=SecretPassword;
So does this one, connecting locally:
Data Source=.\SQLEXPRESS;Initial Catalog=DbName;User ID=SomeUser;Password=SecretPassword;
So what if there are multiple instances of the engine running on a remote computer, and I want to specifically refer to an instance?
Data Source=192.168.1.50\SQLEXPRESS;Initial Catalog=DbName;User ID=SomeUser;Password=SecretPassword;
The above connection string yields
Error connecting to database: A network-related or instance-specific error occur
red while establishing a connection to SQL Server. The server was not found or w
as not accessible. Verify that the instance name is correct and that SQL Server
is configured to allow remote connections. (provider: SQL Network Interfaces, er
ror: 26 - Error Locating Server/Instance Specified)
Why doesn't this work? I can't find any examples of a connection string connecting to a particular instance on a remote database engine.
Try this connection string for remote connection:
Data Source=192.168.1.50\SQLEXPRESS,1433;Network Library=DBMSSOCN;Initial Catalog=DbName;User ID=SomeUser;Password=SecretPassword;
Port 1433 should be opened if firewall is used.
And also try to enable remote connection to DbName in sql server management studio.
Even with an IP address, you must specify the instance name.
Aka,
Data Source=192.168.1.50\SQLEXPRESS
is your best candidate there.
Firewalls. You may have to open the PORT NUMBER. But more importantly, you may have to open up the program name.
Note this article:
http://technet.microsoft.com/en-us/library/ms175043.aspx
Note this area in the article:
In the Program dialog box, select This program path. Click Browse, and navigate to the instance of SQL Server that you want to access through the firewall, and then click Open. By default, SQL Server is at C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\Binn\Sqlservr.exe. Click Next.
ALSO:
I like to use this program to "ping" my machine and port. Emphasis on the "and the port".
http://www.microsoft.com/en-us/download/details.aspx?id=24009
I keep that little tool around for doing basic debugging with connection issues.
Related
I created a set up file and attached the database using SQL Server Express 2008,
but when I run the app, I get this error:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server cannot be found or cannot be accessed.
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 the specified server / instance)
I think it's the data source - is there anyway I can make my data source flexible?
Here is my data source :
SqlConnection cnx = new SqlConnection(#"Data Source=.\OSSAMA;Initial Catalog=assurance_stage;Persist Security Info=True;User ID=sa;Password=2041925");
you need to communicate SQL server with your local IP and port number 1433 or whatever port using and make sure your computer connected to the local network.
refer this issue How to connect to SQL Server from another computer?
There is a workaround to check if your Database is accessible on your target machine
Create a text file and change its extension to .udl and double click it, it would be something like
Put your credentials and test the connection, most of the times the DB is not accessible from the target machine, you may check if firewall is allowing the connection to DB
I am currently having an issue with connecting to my SQL Server Database.
My ConnectionString is as followed:
connectionString = #"Data Source=tcp:192.168.1.63;Initial Catalog=Database;User ID=User;Password=Password";
I am trying to connect to a local database with C#. Currently my Database is on the same PC as my C# code. I already tested the local connection and it works. But trying to connect it with TCP doesn't work.
I am getting 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.
I know I got the DB, ID and Password right. The IP is my IPv4 from IPConfig.
I want to test this program locally before sending it to another pc within my local network. This is why I don't use a local connection.
Does anyone know why I can't connect?
Edit:
I have already enabled the tcp/ip. (See picture)
There are two steps that must be done:
Change the configuration and enable the TCP/IP protocol in
the SQL Server Configuration Manager:
You need to restart the SQL
Server service so it reads the new settings.
i am developing a web application in visual studio 2012. and i have added a database file named as Database1.mdf into App_Data folder and i have given following connection string
Data Source=(LocalDB)\v11.0;AttachDbFilename="E:\asp.net mvc\storage\storage\App_Data\Database1.mdf";Integrated Security=True
after that i have written the code for inserting the data but at that i am getting the error like
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)
is there any mistake in the connection string?
Please help me in htis
Usually, for me, this indicates that SQL Server hasn't been configured correctly to receive remote calls. There are three things to check.
Your server instance is named correctly and you have permissions to it
That you are configured to receive remote connections
That SQL server is open on the the protocols you want to use
To check the second one, open up SQL Management Studio and select Properties on the server. Then check under "Connections" that "Remote Server Connections" is enabled.
To check the third, open up SQL Server Configuration Manager and make sure that "Client Protocols" TCP/IP is enabled as well as Named Pipes (depending on your network setup).
Your connection string should be written like this:
connectionString="DataSource=.\SQLEXPRESS; InitialCatalog=Database; AttachDBFilename=|DataDirectory|\Database.mdf; Integrated Security=SSPI;"
i have a snippet that it work properly when i use windowsmode with follow connection string
data source=.;database=xDB;integrated security=true;
but i have to change it for sql and windows mode i changeit to
Data Source=.;Initial Catalog=xDB;User Id=krs;Password=12345;
but follow error occur
Login failed for user 'krs'. The user is not associated with a trusted SQL Server connection.
and when change dot(.) to(local) another error occur
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)
plz help me im beginer n confused.thank
You have to enable the Named Pipe & TCP/IP in SQL Server configuration. Go through following link to enable that
http://www.triostechs.com/Microsoft-SQL-Server-2008/Microsoft-SQL-Server-2008-Enable-TCP/IP-or-Named-Pipes.html
Also Make sure, only one instance of the SQL Server running. If it is more than one, just verify which one you are connecting to.
On my prod server, I have 2 instances of SQL server, SQL Server 2000 is the default instance, and I have \SQLEXPRESS2008 as an additional named instance. In my web project, I need to connect to the default, SQL 2000 instance.
I'm using LINQ to SQL in Visual Studio 2008.
In the Server Explorer in Visual Studio, I can create a connection to the DB, see all the tables, correctly generate the LINQ to SQL classes, etc.
In Management Studio I can connect to the DB, see everything, edit, etc.
When I try and run my web project code, however, I get:
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)
My connection string in the web project looks like:
<add name="myConnectionString" connectionString="Data Source=myServer.com;Initial Catalog=myDB;Persist Security Info=True;User ID=sa;Password=XXXXX" providerName="System.Data.SqlClient" />
(I'm testing with the sa account out of desperation).
I have other web projects running fine and utilizing the DB, but this is the only one using the LINQ to SQL classes (if that matters)
Help appreciated
Jonathan
If the web server is the same as the SQL server, just use . as the server name; much simpler.
If the web server us not the same as the SQL server, ensure that there is line-of-sight between these servers through any firewalls etc. Also ensure that the server name resolves (in many ways, it is simpler to use the IP address in the connection string if name resolution cannot be guaranteed).
This may be the same thing that happened to me and is one of the most annoying things about LINQ to SQL. Each time you make a change to your dbml, it reverts to the connection used by the server explorer in VS. You must right-click the design surface then manually change the connection back to "myConnectionString", recompile and run.