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SQL Network Interfaces, error: 26

Posted By:      Posted Date: September 17, 2010    Points: 0   Category :ASP.Net
 
My project is working on local machine and I can access remote database from local machine. I have VS 2008 Version 3.5SP1 on local server. My connection string works fine<add key="ConnectionString" value="initial catalog=xxxx;user id=xxxx;password=xxxx;data source=xx.xx.xx.xx"></add>But as I upload my project online I receive 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)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)Source Error:  An unhandled exception was gen


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SQL Server Network Interfaces Error 26 - while failing over SQL Server 2008 R2

  
Before I explain the issue I am facing, I would like to say that I did read the post at  http://blogs.msdn.com/b/sql_protocols/archive/2007/05/13/sql-network-interfaces-error-26-error-locating-server-instance-specified.aspx but in my case the problem is transient (lasts for approximately two minutes after a failover) so items 1-3 in the list of troubleshooting steps do not seem to make sense. As to 4 and 5, the named instances use non-default ports (2433 and 3433 respectively), so I do not know how to tailor the PortQry command for that. I tried  portqry.exe -n ServerA,2433-p UDP -e 1434 and  portqry.exe -n ServerA,2433 -p UDP -e 2434 and it failed both times with a "Failed to resolve name to IP address" while the server was up and serving database requests The same thing happened when I tried it with the failover server as well. ***The issue I am facing*** I am using Enterprise Library 4.1 to connect to a SQL Server 2008 R2 database with a mirror. My connection string itself is as below (with dummy values for all fields): "Data Source=ServerA;Failover Partner=ServerB;Initial Catalog=DBName;User ID=uid;Password=pwd;Connect Timeout=5" Sample .NET code is as below (with modifications to instantiate all variables locally to provide context): SqlDatabase db = new SqlDatabase(ConnectionString); SqlConnection cn = (SqlConnection)db

Damn this (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)

  

 

Well my problem is this error message Message="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)"

 

but :

 

-can't connect to SqlServer Express 2005 on my network server from my application while ITS RUNNING. What I mean is that when I use Server Explorer Window on VS2008 every thing is fine (I can even insert and modify data from server explorer), in fact, when I use Datatables and I choose to preview data through TableAdapters (Design Time) I get data, and also can run the queries from there directly to the data base, but when I'm debbugin the application I get this error.

 

-when I run Sql Server Management Studio, its also fine, even though I can't see the Sql instance on the server (or any of my partners machine) when I try to browse them. But if I type the server path (servername\instancename) everything is OK.

 

-I know the problem is not the connection string 'cause mya partners nd I use the sa

SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified

  

Hi

I am receiving an intermittent error as described in the thread title. I have checked several other threads and the commons solutions seem to be...

check the SQL browser service is running

check the spelling of the instance name

check that the correct UDP port is open on the firewall

All of the above are ok in my case but where my case differs is that the error is intermittent - restarting the server solves the problem but sooner or later, it reocurrs. This specificaly relates to an asp.net application - even when I start getting the error, the web app runs fine over the network but running it in debug or testing / creating connection strings gives error 26. I am all out of ideas with this and it's really not convenient to shut down the server in the middle of a working day. I intended to include the full error text at the end of this question but in the time it has taken me to type this, it has started working again (what the ____!!??!). I am running SQL Server 2008 Express with Visual Studio 2010. Any help would be greatly appreciated.

Regards

Steve

 Update: full error text below...

Server Error in '/' Application.
----------------------------------------------------------

Error " cannot generate SSPI Context Sql Server Network interfaces"

  

Hi all,

I am getting an error while creating OLEDB connection in SSIS Package as following

test connection failed because of an error in initializing provider.Cannot generate SSPI context Sql server network interfaces: the local security authority cannot be contacted.

I have SQL server 2008 R2 version running on local server. I am able to connect to the SQL server using Windows authentication. But when i try to create OLEDB connection in SSIS package i am getting above error.

SQL Browser is running.

I have even checked SQL server configuration and Named pipes are enabled. But still i am getting the same error.

Any idea where to look would be of great help?

Regards

 Gokul


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A network-related or instance-specific error occurred while establishing a connection to SQL Server

  

I just opened the project. Yesterday everything worked fine. It does not work any link database.
Today I open the project and displays:

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)

Source Error:

A network-related or instance-specific error occurred while establishing a connection to SQL Server

  

Hi,

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

A network-related or instance-specific error occurred while establishing a connection to SQL Server.

  

Well, there are many post about this issues but mine is a bit different that I have this problem on my hosting which I can't configure their MS SQL Server. The only thing I can access is Plesk control panel. I have uploaded my mdf file in httpdocs/App_Data, while I establishing the connection it say..

Server Error in '/' Application.

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)

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