How do I fix the error Named Pipes Provider error 40 - Could not open a connection to SQL Server

Question

I can t seem to connect to my database from a site  I get this error      Named Pipes Provider  error  40 - Could not open a connection to SQL Server   I tried using the local IP address to connect as well as a public one  I ve tried    Yes  the site can communicate with the server Named pipes TCP is enabled  Remote connections are allowed  Windows Firewall is off Created an exception for port 1433 in Windows Firewall  Enabled everything in SQL Server Configuration Manager    What else can I do here

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I have one more solution  I think  I recently had changed my computer name so  after I couldn t connect still after trying all above methods  I changed the Server name   Server name     browse for more     under database engine  a new server was found same as computers new name  This worked  and life is good again

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A thread on MSDN Social  Re  Named Pipes Provider  error  40 - Could not open a connection to SQL Server  has a pretty decent list of possible issues that are related to your error  You may want to see if any of them could be what you re experiencing    Incorrect connection string  such as using SqlExpress Named Pipes NP  was not enabled on the SQL instance Remote connection was not enabled Server not started  or point to not a real server in your connection string Other reasons such as incorrect security context try basic connectivity tests between the two machines you are working on

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Did have the same problem  Spent like 6 hours when had to migrate some servers  Tried all suggestions available on this topic and others   Solution was as simple as server restart

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in my case  i had a standalone server  i changed the sql server port default port 1433 in configuration manager to some number and restarted the sql serve service to take effect i was able to connect to the sql server through management studio if i login to the server  but i was not able to connect from my local machine through sql server  i was getting 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  Named Pipes Provider  error  40 - Could not open a connection to SQL Server   Microsoft SQL Server  Error  5   I checked and verified all the below  -Named pipes TCP is enabled  -Remote connections are allowed  -Windows Firewall is off -Created an exception for portin Windows Firewall  this was not necessary in my case as the server is in same subnet network   -Enabled everything in SQL Server Configuration Manager   then i chnaged back the port number to default 1433 and restarted the sql server service  and the issue got resolved and i am able to connect the sql server from my local management studio

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After following all the steps mentioned here  if it still does not connect  try adding the DNS with the IP address in the hosts file in the etc folder  Adding an IP address instead of DNS name in the connection string should be a temporary solution to check if the connection actually works

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Open SQL Server Configuration Manager   Select SQL Server Services from right  Find your server from right and go to its properties  with right click  Change log on method to Local System

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For me it was a Firewall issue   First you have to add the port  such as 1444 and maybe 1434  but also   C  Program Files  x86  Microsoft SQL Server 90 Shared sqlbrowser exe   and    ProgramFiles  Microsoft SQL Server MSSQL12 SQLEXPRESS MSSQL Binn SQLAGENT EXE   The second time I got this issue is when I came back to the firewall  the paths were not correct and I needed to update form 12 to 13  Simply clicking on browse in the Programs and Services tab helped to realise this   Finally  try running the command     EXEC xp readerrorlog 0 1  could not register the Service Principal Name  Null   For me  it returned the error reason

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Use SERVER   INSTANCE NAME   Using double backslash in my project solved my problem

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I struggled for ages on this one before I realized my error - I had used commas instead of semicolons in the connect string

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If you tried restarting the MSSQLSERVER service  and it did not work  this might be a solution    If you are using SQLExpress  your server name should be as the following ComputerName SQLExpress  However  for SQLDeveloper  you do not have to right SQLDeveloper after your ComputerName

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If you are working with Asp net core and using appsettings json than write server as localhost and after write sql instance name for enabled named pipe like this     ConnectionString          dewDB    server localhost  dewelopersql database dewdb User ID sa password XXXXX

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Solving this problem is very easy    Go to control panel  search for services  Open Local services window from your search results Restart your MSSQLSERVER service    Screenshot of the steps

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Thanks to Damian     TCP IP Named Pipes     both enabled  Web Config     for localhost    lt add name  FooData  connectionString  Data Source localhost InstanceName Initial Catalog DatabaseName Integrated Security True   providerName  System Data SqlClient    gt

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You will find most likely your DB name is not correct  you will see the server name in VS like  DESKTOP-0I14BKI  but if you open up SSMS you will see DESKTOP-0I14BKI SQLBLAHBLAH   simply add   SQLBLAHBLAH   instance name  to your  server name  in VS connection properties   You will see    To Fix

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And the simplest solution - check if your slash is back      I spent about an hour trying to figure out what s wrong with SERVER INSTANCENAME when everything is configured correctly  named pipes  user access rights    and suddenly it struck me  it s not a slash  it s a backslash       The horror  the shame

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Enable TCP Ip   Piped Protocol by going to Computer Management - SQL and Services  ensure the Service is On  Enbale the port on the Firewall  Try to login through Command Prompt -  as Admin  last the User Name should be  local  SQLEXPRESS  Hope this helps

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I had just installed SQL SERVER 2012 developer   When I was creating my first SSIS package  I received this pipes error when I was trying to create a data connection task in SQL Server 2012 Data Tools in the Connection Manager box   I resolved with the help of the post above      If choose a named instance and you call your named instance SSQDatabase1 and your pc s name is PCX1    You must enter PCX1 SSQDatabase1 not just SSQDatabase1 or you will receive the named pipes error

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I have suggested below steps to resolve your issue How do I fix the error  Named Pipes Provider  error 40 - Could not open a connection to  SQL Server    Check for working fine SQL Server Services services or not  Also check for working in good condition SQL Server  MSSQLSERVER   Also check for working fine SQL Server Browser  Delete all earlier Aliases  now create new aliases as per your requirements  Now check for working of SQL Server Default Port 1433 Next click on Client Protocols in instance  then click on TCP IP  now click on mouse right click  open the Property  here you can make assure your working fine your default port  SQL 1433  Open your SQL Server Management Studio  then right click  click on  Property  option and then click on Connections tab  then finally tick for Allow remote Connections to this server  Check for right working or your Ping IP Host

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I tried pretty much everything on this page but I had some underlying issues which were actually what needed to be resolved  I was unable to do certain things like open SQL Server Configuration Manager  which ended up being corrupt missing WMI provider files   There are lots of tedious ways to resolve this issues according to what I ve read  but the tool from tweaking com was able to remove and replace repair my WMI  Windows Management Instrumentation  Provider files   I used to do computer repair and overall the tweaking com tool really impressed me  and it was suggested from one of the WMI error forum pages I went to   After I fixed this issue I was able to connect to my SQL db  both locally and remotely   Hope this helps someone

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open port number 1433 on your server for sql remote connection

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In my case  I opened SQL Server Management Studio and searched for SQLEXPRESS in my Database engine   It had two instances and I selected the correct one

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I tried using the local IP address to connect as well as a public one    I ve tried       Yes  the site can communicate with the server Named pipes TCP is   enabled  Remote connections are allowed  Windows Firewall is off   Created an exception for port 1433 in Windows Firewall  Enabled   everything in SQL Server Configuration Manager    i ensured and did the above as well and I just want to share that the DOUBLE BACKSLASH   oBuilder DataSource    SPECIFICPCNAME SQLEXPRESS    Using a SINGLE BACKSLASH resulted into a build error i e   Error    1   Unrecognized escape sequence      I hope this helps the next guy - I ve sacrificed dinner  midnight snack and NBA highlights time solving this  shame   Thanks to  Tamizh venthan

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It s a three step process really after installing SQL Server    Enable Named Pipes SQL Config Manager --  SQL Server Network Consif --  Protocols --  Named Pipes --  Right-click --  Restart      Restart the server SQL Config Manager --  SQL Server Services --  SQL Server  SQLEXPRESS  --  Right-click --  Restart Use proper server and instance names  both are needed   Typically this would be   SQLEXPRESS  for example see the screenshot from QueryExpress connection dialog      There you have it

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I was trying to add a new connection in VS2015  None of the suggestions here worked  Suspecting some sort of a bug in the wizard  especially since SSMS was able to connect just fine  I decided to try and trick it  It worked    Instead of adding the connection  use  Create new SQL Server Database   Enter your server name and a random name for the new DB  e g   test   Assuming this succeeds  open Server Explorer in VS  locate the connection in Data Connections  right-click it and select Modify Connection  Change  test   from step 1  to the name of the existing database you want to connect to  Click  Test Connection   This time it should work  Delete the temporary database you created in step 1

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Try the following steps    Open Services window  open  run box  and type services msc   Looking for SQL services  with SQL prefix   Start them  if cannot start  Goto step 4   Right click to each service -  Properties -  Change to tab  Log on -  choise log on as  Local      -  0K  Then start SQL services again    Try Open SQL and connect database

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TL DR  Your SQL Server instance is using dynamic ports which is not working  Force SQL Server to use static port   1433   Complete Details  First of all this problem is more likely if you ve a mix of default and named instance or named instances only which was my case    Key concept  Each instance of Microsoft SQL Server installed on a computer uses a different port to listen for incoming connection requests  Default instance of SQL Server uses port   1433  As you install named instances then they will start using dynamic ports which is decided at the time of start-up of Windows service corresponding to named SQL Server instance   My code was failing  with error code 40  to connect to the only named SQL Server instance that I had on my VM  You can try below possible solutions   Solution   1  Client code trying to connect to SQL Server instance takes help from SQL Server browser service to figure out port number at which your named instance is listening for incoming connections  Make sure SQL browser service is running on your computer   Solution   2  Check the port    in yellow color  your named SQL Server instance is using from SQL Server configuration manager as shown in the snapshot below      Use that port number explicitly in your connection string or with sqlcmd shown below   sqlcmd -s mymachinename 11380 -i deleteDB sql -o SQLDelete txt   Solution   3  Force your named instance to use port   1433 which is used by default instance  Remember this will work only if you don t have any default SQL Server instance on your computer as the default SQL Server instance would be using using port   1433 already  Same port number can t be uses by two different Windows services   Mark TCP Dynamic ports field to blank and TCP Port field to 1433     Change the port number in your connection string as shown below   sqlcmd -s mymachinename instanceName -i deleteDB sql -o SQLDelete txt   OR   sqlcmd -s mymachinename 1433 -i deleteDB sql -o SQLDelete txt   Note  Every change in TCP IP settings requires corresponding Windows service restart   Interestingly enough after resolving the error when I went back to dynamic port setting to reproduce the same error then it didn t happen  Not sure why   Please read below interesting threads to know more about dynamic ports of SQL Server   How to configure SQL Server Port on multiple instances   When is a Dynamic Port    dynamic      When to use a TCP dynamic port and when TCP Port   I got leads to solution of my problem from this blog

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Very simple solution     use  local  InstanceName that s it  it worked for me

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I had this issue but none of the suggestions above fixed it    I was seeing this issue when I deployed my website to IIS  The fix was to go into advanced settings against the default app pool and change the identity property from the default to Administrator

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I had the same problem  I use the MSSQL Server Management Studio 2017 and solved this problem using these steps    Check for working fine SQL Server Services services or not  Also check for working in good condition SQL Server  MSSQLSERVER   Also check for working fine SQL Server Browser  Restart SQL Server  MSSQLSERVER    and fixed it

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I had the same problem and solved the problem by disabling my firewall ESET    The first step to solve this problem should be to try pinging your own computer from another computer  If you have firewall on  you may not be able to ping yourself  I tried pinging my own pc  then ping was failed didnt get response from the server

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i Just enabled TCP IP VIA Named Pipes in Sql Server Configuration manager   My problem got solved refer this for more info Resolving Named Pipes Error 40

[sql-server] How do I fix the error 'Named Pipes Provider, error 40 - Could not open a connection to' SQL Server'?

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