Anyone have an idea how to solve this problem?
A network-related or instance-specific error occured while establishing a connection to SQL Server. The server was not found or was not accessible.
Verify taht the instance name is correct and that SQL Server is configured to allow remote connection. (provider: SQL Network Interfaces, error: 26 - Error locating Server/Instance specified)
Thanks in advance!
Make sure the instance of the server is started. Do this from Start Menu-> Microsoft SQL Server... ->Configuration Tools->SQL Server Configuration Manager->SQL Server Services
If it is not on your local machine, i.e. on a remote server, then your account needs a login on the SQL Server that is granted access to the DB you are trying to connect to.
Usually the local server instance by default is installed with access for yourself. But it doesn't hurt to check.
Also if it is remote, can others connect successfully? If not, then you may also need remote connections enabled on SQL Server.
Making sure you have the name of the instance correct is important. Slashes should be back slashes, not forward slashes. What are you using for the instance name?
Related
I'm trying to use POCO to connect to my database.
Whenever I try to connect, I get this error:
Failed to load provider "System.Data.SqlClient".
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)
NOTE: it's a local database, and remote access is enabled, TCP/IP is enabled, and the SQL Server service is running.
I'm using .NET Core 7
Can anyone tell me how to solve this?
Thank you all
I'm trying to connect to an SQL database hosted on Azure from a function app I'm building in Visual Studio but I'm 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. (provider: TCP
Provider, error: 0 - An attempt was made to access a socket in a way
forbidden by its access permissions.)
I can connect from the same PC using SSMS without a problem. I've tried connecting to the database using data connections in server explorer in VS but I'm getting the same error. If I connect to Azure with my account in server explorer it shows me a selection of services including SQL databases but there are none listed underneath although my account does have access to the database.
Are there any hidden gotchas I'm missing or settings within VS? I've also tried adding my client IP in the firewall settings but that didn't make a difference either.
After doing some more testing it turned out to be the client firewall that was blocking VS and VS Code from connecting to Azure SQL. It seems there was already an exception for SSMS.
The error message states "Verify that the instance name is correct"
It could be that the SSMS is automatically creating a fully qualified name once you say that it is an azure database.
If you use the short name from Visual Studio, then you cannot connect to the SQL server.
For example "myserver.database.windows.net" versus "myserver".
I have a web application that uses a local SQL Server Express database (a.k.a. ~/App_Data/ASPNETDB.MDF).
When I deploy to IIS 7.0 on Windows 2008 Standard (SP2), I get 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)
The error message goes on to offer some advice
SQLExpress database file auto-creation error:
The connection string specifies a local Sql Server Express instance
using a database location within the application's App_Data directory.
The provider attempted to automatically create the application
services database because the provider determined that the database
does not exist. The following configuration requirements are necessary
to successfully check for existence of the application services
database and automatically create the application services database:
If the application is running on either Windows 7 or Windows Server
2008R2, special configuration steps are necessary to enable
automatic creation of the provider database. Additional information
is available at: http://go.microsoft.com/fwlink/?LinkId=160102. If
the application's App_Data directory does not already exist, the web
server account must have read and write access to the application's
directory. This is necessary because the web server account will
automatically create the App_Data directory if it does not already
exist.
If the application's App_Data directory already exists, the web
server account only requires read and write access to the
application's App_Data directory. This is necessary because the web
server account will attempt to verify that the Sql Server Express
database already exists within the application's App_Data directory.
Revoking read access on the App_Data directory from the web server
account will prevent the provider from correctly determining if the
Sql Server Express database already exists. This will cause an error
when the provider attempts to create a duplicate of an already
existing database. Write access is required because the web server
account's credentials are used when creating the new database.
Sql Server Express must be installed on the machine.
The process identity for the web server account must have a local user profile. See the readme document for details on how to create a
local user profile for both machine and domain accounts.
I don't understand how to troubleshoot 4. (where can I find the "readme document"?). However, the other items look correct to me.
Specifically...
The app pool in question is running as NETWORK SERVICE (not Application Pool Identity)
The user NETWORK SERVICE has Full Control of App_Data (do I understand correctly that it does NOT need Read/Write for App_Data's parent, since App_Data is already created?)
Interestingly, if I copy ASPNETDB.MDF and ASPNETDB.LDF from my development machine to the production App_Data, the error changes:
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) Description: An unhandled exception occurred during the
execution of the current web request. Please review the stack trace
for more information about the error and where it originated in the
code.
Exception Details: System.Data.SqlClient.SqlException: 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)
What am I missing?
I had the same error before and the problem was that my SQL Server service was stopped, this is pretty weird but sometimes they just crash,I had to reinstall SQL Server cause the service didn't even alloud me to start it,so you may want to check this.
I ended up moving the relevant tables to a new SQL Server database because I could not resolve the permissions issue.
That is the recommended approach anyhow for a production application, though it seems unfortunate that it was so hard (in terms of determining how to configure security) to deploy the ASPNETDB.MDF variant for a very low-volume website.
been trying to configure an ADO.NET connection for my Visual Studio application but I am running into issues and having no luck at all troubleshooting them. The major error that I run into is:
A network-related or instance-specific error occurred while establishing a connection to SQL server. The server was not found or not accessible. Verify the instance name is correct and that SQL server is configured to allow remote connections (Error 40: Could not open connection to the SQL server)
The steps I undertook to troubleshoot this are:
1. Open up Sql server configuration manager and under the SQL Server Network Configuration, Protocols for MSSQLSERVER,SQLExpress, SQL server 2008 connection string data source I enable each of the protocol names (Shared memory, Named pipes,TCP/IP,VIA)
As instructed I stop the SQL server services first under the SQL server services nodes.
Now I click start, MSSQL server service starts but both SQL Server 2008 and SQLEXPRESS agents do not. Stating the following:
The request failed or the service did not respond in a timely fashion. Consult the event log or other applicable error logs for details
This might just be the problem as when I attempt to create the connection string , the server name specified is MYWORLD/SQL SERVER 2008. Since the SQL server 2008 agent service refuses to start, the connection fails, leading to the first error message.
Does anybody have any leads on this and can let me know the necessary steps to mitigate this.
The SQL Browser service must be running to connect to a named instance.
Use SQL Servr Configuration Manager under Configuration Tools under Microsot SQL Server 2008 to assign the logon accounts for each service you want to run. Do NOT use any other method to assign user accounts because the correct rights will not be enabled.
I have a web-application which is reciving the following while trying to connect to a database hosted on another 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)
Now, there problem here is that the connection strings, and the server paths area all perfect.
The site run correctly when run via cassini, on my local machine. (Connections strings are correct.)
Other sites hosted on the same server are able to access the databse. (Server paths ara all active.)
While the error says it's been unable to connect, Activity Monitor is aware of the query, and the Server Logs show no error. (Just odd.)
Google & Bing have massively failed with this, so I guess it's time to hit the Stack!
Open the Sql Server Conifguration Manager, expand Sql Server 2005 Network Configuration, click Protocols for <Yourserverinstance>, then check TCP/IP is enabled.