Name pipes error 40

Provider: Named Pipes Provider, error: 40 — Could not open a connection to SQL Server



Unable to save template after making changes.


Error message when attempting to hit save:

Template [Document] failed to save in DR
Problem description
Clarity.10026 Template [Document] failed to save.

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: Named Pipes Provider, error: 40 — Could
not open a connection to SQL Server)


The cause for this issue is that the cube’s relational connection source is pointing to a relational database on a separate server environment.

Diagnosing The Problem

Reconfirm all connection/detail to ensure that both the relational database and olap cube connection strings are from the same server.

— Open up Analysis Services

— Select the database that is being used and expand

— Select Data Sources, and further expand.

— Select the datasource and right click and select properties.

— Examine the Connection String information to see if the relational database used is on the same server as Analysis Services.

Resolving The Problem

In this case, the issue lies in the connection string for the cube. Analysis Services was on one server and the corresponding relational database was on another. The customer forgot to repoint the database after moving the database from a production environment.

Edit the connection string to use the same server as the Analysis Service and this should correct the problem.

If the databases are required to be on separate servers, please refer to technote # 1583743


Name pipes error 40

This forum has migrated to Microsoft Q&A. Visit Microsoft Q&A to post new questions.

Answered by:


I’m encountering an issue with «Named Pipes Provider, error: 40 windows» and am having problems determining how to fix it due to the environment I’m using. I have two SQL Servers installed on two separate Win2K3 Server boxes, one is SQL Server 2000 and the other is SQL Server 2005. The SQL Server 2000 contains the actual application data. The 2005 database is used only for Reporting Services. I’ve set up the reports on SSRS such that their datasources hit the 2000 server. This is using SQL Server authentication.

When testing the reports via SSRS (in Visual Studio 2005), the connection to the data works and the reports are generated fine. When I deploy them to the reporting server and launch IE to test locally (still on the 2005 box), I get this «Named Pipes Provider, error 40» issue. I made sure that Named Pipes and TCP were enabled and the port set at 1433 (to match that on the 2000 box).

Now I changed the datasource’s authentication from SQL Server to Windows authentication. I tested this in SSRS and this works too. When I redeployed the reports with this authentication change, testing the reports via IE locally (on the 2005 box) worked. Great. Now when I open IE on an external box, i.e. on the 2000 box, and try to test the reports, I get this same error 40 issue. I’ve been through a few threads describing the error 40, fiddling around with the SQL Server configuration as well as SSRS, to no avail. I have a feeling this error 40 issue has to due with permissions/authentication between the SQL Server boxes but I can’t really be sure. Anyone have any ideas on how to troubleshoot my situation. Thanks.


Named Pipes Provider, error: 40 — Could not open a connection to SQL Server :

I. Incorrect connection string, such as using SqlExpress.

Читайте также:  Initialize error unknown device name hawaii

The typical error when dealing with Express includes:

a. User is not aware of SqlExpress was installed as a named instance, consequently, in his/her connection string, he/she only specify «.»,»localhost» etc instead of «.\SqlExpress» or » \Sqlexpress».

b. Np was disabld by default after installing SqlExpress.

c. If Sqlexpress was installed on the remote box, you need to enable remote connection for Express.

Please read the following blog for best practice of connecting to SqlExpress.

II. Named Pipes(NP) was not enabled on the SQL instance.

Oppose to SQL 2000 which turn on all protocols, SQL 2005 SKUs turn off NP by default. So, when you see this error, please check:

1) Go to SQL Server Configuration Manager, See Server has NP enabled.

2) %windir%\program files\microsoft sql server\mssql.1\mssql\log, notepad ERRORLOG, see whether Server is listening on NP. You should see «Server named pipe provider is ready to accept connection on [ \\.\pipe\sql\query ] or [\\.\pipe\mssql$ \sql\query]»

3) Notice that «sql\query» is the default pipe name, so you need to know server is listening on which pipe name. eg: if you specify server pipe name is «sql\query1», then you would see in the errorlog that server listening on [ \\.\pipe\sql\query1 ], and go to SQL Server Configuration Manager, click client Named Pipe properties, see whether the pipe name is same with the one server listening on.

4) If you are using SQL Native Client ODBC/OLEDB provider( or SQLNCLI), go to SQL Configuration Manager, click client protocols, make sure NP and TCP are both enabled. Right click properties of NP, make sure client is using the same pipe name as server for connection.

5) If you are using MDAC ODBC/OLEDB( or SQLOLEDB) provider, in command line, launch «cliconfg.exe» and make sure NP enabled and right pipe name specified.

III. Remote connection was not enabled.

Check out: when you right click on the Server in SQL Server Management Studio, in Connections, the Remote server connections part, you have enabled the » Allow remote connections to this server » check box

If you are making a remote connection, namely, your target SQL Server is on the different box as client application, you might need to check whether:

a. «File and Printer Sharing» was opened in Firewall exception list.

b. Please see the blog for enabling remote connection for express and troubleshooting tips of remote connection.

IV. Server not started, or point to not a real server in your connection string.

Check out: Open SQL Server Surface Area Configuration and ensure all the required services are started, Remote Connections are configured.

a. use «sc query mssqlserver» for default instance or «sc query mssql$ » to make sure SQL Server was started. Sometimes, reseason behind the broken of your client application w/ this error:40 might be SQL server restarted and failed, so, it’d better for you to double check.

b. User specified wrong server in their connection string, as described in the forum discussion, «MSSQLSERVER» is an invalid instance name. Remember, when you connect to default instance, could be best representitive for the instance, when you connect to a named instance such as sqlexpress, you should specify \ as data source in your connection string.

V. Other reasons such as incorrect security context.

Such error also occured during user operation such as moving database or db mirroring or cluster, any DB OP that might invovle different sql instances, namely, the destination database is located in another sql instance and user is not aware of the state of the destination. I recommend you first isolate whether this fail is during connection stage or data operation stage.

a. During data operation, you are normally asked to type in the destination server name whether it is default to «(local)» or another server » «. So, remember the exact string that represent the target instance, then when the error repros, open command line, use «sqlcmd -S -E» ,see what happens, if the connection fail, please follow up above I — IV troubleshooting lists. otherwise continue.

b. If you can make basic conection, but still face the error, then there must be something that server reject the connection or client close the connection for some reason.

Читайте также:  Error c2415 недопустимый тип операнда

VI. Please try basic connectivity tests between the two mahcines you are working on. One simple way to verifty connectivity is to use command line tools, such as osql.exe. For example, osql -E -Stcp ervername\instancename. If it connects cross-machine successfully, please also verify that your connection string in your scenario is correct.

Here are some blogs which could be helpful: just follow the basic connectivity troubleshooting guidelines on the SQL Protocols blog, see:

SQL Server 2005 Connectivity Issue Troubleshoot — Part I

SQL Server 2005 Connectivity Issue Troubleshoot — Part II


Error: 40 – could not open a connection to sql server

In this SQL Server tutorial, we will learn how to resolve the “provider: named pipes provider, error: 40 – could not open a connection to sql server” error. So, in this tutorial, we will discuss the root cause of this error and will also discuss how to solve the error, could not open a connection to sql server error 40.

Table of Contents

Could not open a connection to sql server

Recently, I have encountered this error while connecting to the Database Engine using SQL Server Management Studios. The complete error message is shown in the image below.

Cannot connect to
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. error 40 – could not open a connection to sql server.

Let’s first discuss some of the main reasons behind this error message.

  1. We might be using wrong server name to connect due which the failure has occured.
  2. The SQL Server Service is not running properly or it might have wrong default settings.
  3. The SQL Server do not have permission to allow an remote connection.
  4. The host machine might have wrong firewall settings.

Don’t worry if you don’t know how to resolve these issues to overcome this error. Here are some of the steps that we can follow to overcome these issues.

Fix 1: Use Correct Server Name

Many times the main reason behind this error is the use of the wrong server name while connecting. To connect to the Database Engine in the SQL Server, we need to provide some login details such as username, password, and server name.

Now, it is important to use the correct server name. By default, the server name is in the following format – “ComputerName\InstanceName“.

In this format, the ComputerName is the name of the machine or computer. Now, if you are using Windows 10 OS, you can get this name by opening the About page in your System settings. An example for this is shown below.

Next, in the server name is InstanceName which is the name of your SQL Server instance. Now, to get the instance name, we need to open the Services setting in our system.

And from the list, we have to find the SQL Server Service. The instance name is there in the brackets of the service name. The example is demonstrated below.

In our case, the name of the instance is SQLEXPRESS. So, the server name will be similar to “DESKTOP-XXXX\SQLEXPRESS“.

Fix 2: SQL Server should be up and running

The second root cause for this error can be that your SQL Server instance is not running. Now, to check wheater the instance is running or not. First, we need to open the “SQL Server Configuration Manager“.

In SQL Server Configuration Manager, first, click on SQL Server Services then, a list of services will appear on the right pane. From the list check the state of the “SQL Server” service. And we can also right-click the service and click on “Start” to start the service.

Next, we should also confirm whether the SQL Server Browser is running or not in the same way.

Fix 3: Enable TCP/IP in SQL Server Configuration

Whenever multiple SQL Server instances are connected across a network, they all use TCP/IP for communication. So, to resolve this error, we have to confirm whether the TCP/IP is enabled or not. For this, again we will use the “SQL Server Configuration Manager“.

Читайте также:  Error 0x800c0008 windows live

In SQL Server Configuration Manager, first, expand the “SQL Native Client 11.0 Configuration” then, click on “Client Protocols“. A list of protocols will appear on the right pane. From the list check the state of TCP\IP. And we can also right-click it and click on the “Enable” option to enable it.

Next, we can also confirm whether TCP\IP is working on the default ports or not. For this, first, right-click TCP\IP and click on Properties. Next, from the General category, we can confirm whether the default port is 1433 or not.

Fix 4: Allow Remote Connections

Other than enabling the TCP\IP, we have to enable the remote connection settings from the SQL Server properties. For this task, we can use SQL Server Management Studio. Here are steps to enable the property using SQL Server Management Studio.

  • From the Object Explorer, right-click on the server name and click on “Properties” option.
  • Next, open the Connection properties section and tick mark the “Allow remote connections to this server” option. In the end, clcik on “OK” to save changes.

Fix 5: Allow SQL Server in Firewall Settings

The Windows Firewall is quite effective at safeguarding the operating system from various dangerous threats. By default, the firewall prevents numerous ports and services from running.

To overcome this issue, we can add a firewall exception for TCP/IP ports 1433 or 1434. So, the SQL Server can run without any issue.

The steps to add the exception in the Windows firewall are as follows.

  • First, search for “Windows Defender Firewall with Advanced Security” in our start and open it.
  • Next, from the left pane click on “Inbound Rules” and then, click on “New Rule“. It will open a new “Inbound Rule Wizard” window.
  • In the new window, first, select “Port” and then click on “Next“. After this, select the “TCP” option and specify the port number as 1433.
  • Next, we need to select the “Allow the connection” option and click on the “Next” button.
  • Next on the Profile page, tick marks the options as per your requirements and again click on the “Next” option.
  • On the last Name page, specify the name and description for the exception and click on the “Finish” button.

With this, we have added the new firewall which will allow having a remote connection in SQL Server.

By following all the given solutions, we can resolve the error and we can easily connect to the SQL Server instance.

So, in this tutorial, we have learned how to resolve the “provider: named pipes provider, error: 40 – could not open a connection to sql server” error. In this, we have discussed the root cause of this error and also the possible solution for it.

You may also like to read the following SQL Server tutorials.

I hope this will help to fix the below errors:

  • named pipes provider, error: 40 – could not open a connection to sql server
  • a network-related or instance-specific error in sql server 2014 error: 40
  • a network-related or instance-specific error in sql server 2019
  • named pipes provider: could not open a connection to sql server (53)
  • could not open a connection to sql server error 40
  • error 40 – could not open a connection to sql server
  • error 40 could not open a connection to sql server error 53

I am Bijay having more than 15 years of experience in the Software Industry. During this time, I have worked on MariaDB and used it in a lot of projects. Most of our readers are from the United States, Canada, United Kingdom, Australia, New Zealand, etc.

Want to learn MariaDB? Check out all the articles and tutorials that I wrote on MariaDB. Also, I am a Microsoft MVP.