I am attempting to write a C# app that will attach to the 2008 SQL Server I have installed on my PC, but I am missing something, I think with the SQL Configuration.
I am able to connect to the SQL Server in MS-SMS, using both authentication modes.
The SQL Server is named HP_Deskyop\LPR_Home & is running on port 51650.
I have verified that TCP/IP & Named Pipes are enabled for this server.
I am running Norton 360, but I have disabled Smart Firewall.
I am receiving the error below when the Open() line is executed.
conn = new SqlConnection(Properties.Settings.Default.ConnString);
var cmd = new SqlCommand(strSQL, conn);
cmd.Connection.Open();
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 is
Data Source=LPR_HOME;Initial Catalog=Northwind;User
ID=sa;Password=XXXXXXX;
I have attempted numerous variations of the connection string, with no luck
HELP!!!!!
Change your Connection String to:
Data Source=HP_Desktop\LPR_HOME;Initial Catalog=Northwind;User ID=sa;Password=XXXXXXX;
This did the trick.
I haven't tried this myself, but there might be limitations in talking like this over the network with windows phone 7. While Windows phone 7 can use the SQL Compact edition, I don't think it can talk to other SQL servers without going through an intermediate API? What would the app do if you weren't on your home network?
One possibility is that your firewall is blocking the ports that allow connections to SQL Server; The following post from MSDN has a fairly comprehensive set of information as to the port numbers and the respective purpose:
http://msdn.microsoft.com/en-us/library/cc646023.aspx
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 was wondering why I can't connect my application (C# Form from another pc) to my SQL Server?
I have followed these links, and use Virtual Box as my VM.
https://www.youtube.com/watch?v=aIovZluNmNs
How to connect to SQL Server from a C# program on another computer
Connecting to SQL server from another computer
Enable TCP/IP from the Configuration Manager
Use TCP Port 1433 (IPALL)
Restart SQL Server from the Configuration Manager
Added TCP Port from the Firewall (also UDP Port 1434, and SQLServer.exe), both server and VM
From my VM, I can ping my server ip (192.168.1.10)
But I still 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: TCP Provider, error: 0 - No such host is known.)
Connection strings that I have tried are:
Data Source=ip_address,1433; Initial Catalog=inventory; Integrated Security=True
Data Source=server_name,1433; Initial Catalog=inventory; Integrated Security=True
Data Source=ip_address,1433; Initial Catalog=inventory; Integrated Security=False
Data Source=server_name,1433; Initial Catalog=inventory; Integrated Security=False
First add a new user to login your credentials.
Your connection string should be look like this
Data Source=(server);Initial Catalog=(server);User ID=(username);Password=(password)
Next open your Windows Firewall with advanced security on your server.
Add new rule.
Select TCP and set on specific local port 1433.
Allow the connection.
and restart your server and try to connect again.
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.
I share two computer with local network
computer1 : Windows XP, ip = 192.168.0.1
computer2 : Windows 7 , ip = 192.168.0.2
Now I want to connect to a SQL Server 2005 database that exists on computer1 from copmuter 2 with a win app
I use below connection string and check Surface Area Configuration for Services and Connections but I get an 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.SQL Network
Interfaces, error: 26 - Error Locating Server/Instance Specified
Connection string:
Data Source=192.168.0.1;Initial Catalog=DBName;Integrated Security=True
and
Data Source=192.168.0.1;Initial Catalog=DBName;Integrated Security=false
As your error message says, it could be a network-related error.
Does your server really have the IP 192.168.0.1?
Does it accept incoming connections?
Do you run a firewall such as the windows firewall that blocks incoming connections?
It could also be that you have not configured your sql server to accept remote connections, but only connections from localhost.
Data Source=192.168.0.1;Initial Catalog=DBName;Integrated Security=false
Here you must specify the Uid= your usernam**e and **Password=password.
Because you are making integrated security= false
As dontomaso pointed out, check that "Allow Remote connections" option is enabled on the server. If i recall, its disabled by default.
(cant post images directly yet, heres the link)
Allow Remote connections option screenshot
If you connect from another machine you check the configuration:
SQL service account: NetworkService
Ensure SQL server running the SQL Browser service
In the Protocols:
Named pipes: set Enableb (to connect the computer to install SQL user name)
TCP / IP: Enableb set (to connect using the IP address of the machine IP_dia LAN)
-> 2 This section Enableb all, they want to use way also.
Shared Momory: DISABLED choose, if this part is ENABLEB can not connect via LAN or Internet.
(string strCon = "Data Source=192.168.0.1,1433;Initial Catalog=DatabaseName;User ID=sa;Password=sa";)
To connect via the Internet you here take your network IP address on the Internet.