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Error 40 Could Not Open a Connection to SQL Server – Resolved

Nilesh Kumar | Modified: July 8, 2022 | SQL Server | 6 Minutes Reading

If you are SQL Administrator then must have faced several SQL Server-related errors. The life of database admins won’t exactly be bug-free. SQL Server Error 40 is a common problem that users face. Let us consider the real-time problem faced by users.

Yesterday morning I was sitting in sitting in a yard and I tried to connect to my Microsoft SQL Server. Suddenly I got error 40 in SQL server database. Can anyone tell the possible reason behind this error issue? And also the best possible methods to fix this error. Thanks! 

At the point when we attempt to connect with the SQL Server, ordinarily, we get an Error as Provider: Named Pipes Provider, Error: 40 – could not open a connection to SQL Server.

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Are you also hunting for a solution to resolve this issue? If yes then I suggest you read this article. We will discuss the possible causes of this error and the best possible solution to tackle this problem. In case you want to solve SQL database is corruption to eliminate inaccessible data issues, here’s an instant solution. Users can take the help of Emaildoctor MDF Data Recovery Tool easily.

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Provider: TCP Provider, Error: 40 – Could Not Open A Connection to SQL Server – Reasons 

  1. SQL Server does not have the authority to permit remote connection.
  2. This is because of a failure in connecting with the server case we are using.
  3. This error 40 in SQL server may also pop up due to badly configured firewall settings.
  4. An inappropriate default setting is a common reason for this error in the majority of cases.

Manual Ways to Fix Could Not Open a Connection to SQL Server Error 40

Now,  we have the manual ways to solve provider: named pipes provider, error: 40 – could not open a connection to SQL server issue. However, these solutions are not at all recommended by industry experts.  We are giving this solution just because of users’ requests for this. Furthermore, in order to resolve this issue, follow the underneath offered answers for resolve these issues:

1. SQL Server example is not running.

Go to Services choice, click on SQL Server installed in your framework, I have SQL Server instance installed with name: MSSQLSERVER. On the off chance that it is in not Started Status, at that point start it by right tapping on it and click on the START option.

2. Make Sure to Enable TCP/IP in the First Place

To make it empower follow the means:

  1. Click on Configuration Manager of SQL Server.
  2. Presently you can check the TCP/IP port status as Enabled or Disabled. You have to make it Enable and click on status to change port Properties.
  3. Presently fill Default Port no 1433 Click on the OK button.

3. Permit Remote Connections empowered under Connections in SQL Server Properties:

Follow the underneath offered steps to empower it & solve error 40 in SQL server.

  1. First, open SQL Management Studio at that point right-click on the Server Name and select the Server Properties.
  2. In the Server Properties under the Connections Options, you have to check the box of Allow remote connections with this server and afterward, click on the Ok button.

Permit SQL Server in Firewall Settings: The Final Step to Solve SQL Error 40

This is the Final Step-4 for solving the error smartly. Carefully learn all the crucial aspects here. 

You have to include a Windows Firewall exemption the server for SQL TCP ports 1433 and 1434, so that SQL Server will run. Go to ControlPanel then System&Security or legitimately search it on your framework search as Windows Firewall in this click on the Firewall, here you can see Action tab as Allow for Firewall. You can change it through SQL Server Properties to permit or block.  However, a lot of users found this method  very complex to counter provider: named pipes provider, error: 40 – could not open a connection to SQL server challenge.

So far we have seen the method to resolve Could Not Open a Connection to SQL Server Error 40. Moreover, if your SQL database file is corrupted or damaged then, you are not able to access your database. So, for this, it becomes very difficult to access the database. Also, there is a manual method to fix the corrupted database files, by using DBCC CHECKDB repair allow options. By using this manual method, you can fix only minor-level corruption. Also, sometimes this causes data loss issues.

But, to fix the highly corrupted damaged file without any risk of data loss the best and automated method is by using enterprise software, for example, SQL Database Recovery software. This software is quite advanced with an easy and simple interface so that non-technical users can also recover the database files. Moreover, this software supports every OS version for solving SQL error 40.

Moreover, this automated solution also let you remove recovery pending state in SQL Server issue as well. There are several other qualities of this tool exists that you can get benefitted from.


Nowadays, there are many organizations and users use MS SQL for database management. But often time people faced the “Could not open a connection to SQL Server error 40” issue. Therefore, in this blog, we have discussed the reasons why this error occurs. And, also the solution to fix this issue. In case if your SQL database file is corrupted then you can take the help of the expert solution.

Using the automated is the best solution to tackle provider: TCP provider, error: 40 – could not open a connection to SQL server. On the other hand, the manual solution is way behind due to the limitations & risk factors present in it. Selection of the right method & tool for solving error 40 in SQL server  is very crucial & can affect the end results. SO make your decision wisely.

Also Read: Introduction to SQL Server Error 15105 & Best Ways to Fix It