Can t connect to localhost on SQL Server Express 2012 2016

Question

I just downloaded the latest version of SQL Express 2012 but I cannot connect to localhost  I tried localhost SQLExpress and Windows authentication but it gives me an error message saying cannot connect  Am I missing something here  I ve used SQL Server 2008 before and I ve never had issues connecting to localhost  It seems that it can t even find it  Also in the Services I only see a SQL Server VSS Writer  Is this the way it should be  Or am I missing something  Thanks

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My situation

empty Instance Name in SQL Server Management Studio > select your database engine > Right Mouse Button > Properties (Server Properties) > Link View connection properties > Product > Instance Name is empty
Data Source=.\SQLEXPRESS did not work => use localhost in web.config (see below)

Solution: in web.config

xxxxxx = name of my database without .mdf yyyyyy = name of my database in VS2012 database explorer

You can force the use of TCP instead of shared memory, either by prefixing tcp: to the server name in the connection string, or by using localhost.

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring%28v=vs.110%29.aspx

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All my services were running as expected  and I still couldn t connect   I had to update the TCP IP properties section in the SQL Server Configuration Manager for my SQL Server Express protocols  and set the IPALL port to 1433 in order to connect to the server as expected

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The problem for me was that I was not specifying     I was only specifying the name of the instance    did not work  SQL2016 worked    SQL2016

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I had a similar problem - maybe my solution will help   I just installed MSSQL EX 2012  default install  and tried to connect with VS2012 EX   No joy   I then looked at the services  confirmed that SQL Server  SQLEXPRESS  was  indeed running   However  I saw another interesting service called SQL Server Browser that was disabled   I enabled it  fired it and was then able to retrieve the server name in a new connection in VS2012 EX and connect   Odd that they would disable a service required for VS to connect

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According to Aaron Bertand    You need to verify  that the SQL Server service is running  You can do this by going to Start  gt  Control Panel  gt  Administrative Tools  gt  Services  and checking that the service SQL Server  SQLEXPRESS  is running  If not  start it  While you re in the services applet  also make sure that the service SQL Browser is started  If not  start it  You need to make sure that SQL Server is allowed to use TCP IP or named pipes  You can turn these on by opening the SQL Server Configuration Manager in Start  gt  Programs  gt  Microsoft SQL Server 2012  gt  Configuration Tools  or SQL Server Configuration Manager   and make sure that TCP IP and Named Pipes are enabled  If you don t find the SQL Server Configuration Manager in the Start Menu you can launch the MMC snap-in manually  Check SQL Server Configuration Manager for the path to the snap-in according to your version    Verify your SQL Server connection authentication mode matches your connection string    If you re connecting using a username and password  you need to configure SQL Server to accept  SQL Server Authentication Mode    -- YOU MUST RESTART YOUR SQL SERVER AFTER RUNNING THIS  USE  master  GO DECLARE  SqlServerAndWindowsAuthenticationMode INT   2  EXEC xp instance regwrite   N HKEY LOCAL MACHINE     N Software Microsoft MSSQLServer MSSQLServer     N LoginMode     REG DWORD     SqlServerAndWindowsAuthenticationMode  GO  If you re connecting using  Integrated Security true   Windows Mode   and this error only comes up when debugging in web applications  then you need to add the ApplicationPoolIdentity as a SQL Server login   otherwise  run Start - gt  Run - gt  Services msc If so  is it running    If it s not running then  It sounds like you didn t get everything installed  Launch the install file and chose the option  New installation or add features to an existing installation   From there you should be able to make sure the database engine service gets installed

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After doing the steps which were mentioned by  Ravindra Bagale   Try this step   Server name  localhost  Instance name you were gave

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First try the most popular solution provided by Ravindra Bagale   If your connection from localhost to the database still fails with error similar to the following      Can t connect to SQL Server DB  Error  The TCP IP connection to the host  IP address   port 1433 has failed  Error   Connection refused  connect  Verify the connection properties  Make sure that an instance of SQL Server is running on the host and accepting TCP IP connections at the port  Make sure that TCP connections to the port are not blocked by a firewall      Open the SQL Server Configuration Manager  Expand SQL Server Network Configuration for the server instance in question  Double-click  TCP IP   Under the  Protocol  section  set  Enabled  to  Yes   Under the  IP Addresses  section  set the TCP port under  IP All   which is 1433 by default   Under the  IP Addresses  section  find subsections with IP address 127 0 0 1  for IPv4  and   1  for IPv6  and set both  Enabled  and  Active  to  Yes   and TCP port to 1433    Go to Start  gt  Control Panel  gt  Administrative Tools  gt  Services  and restart the SQL Server service  SQLEXPRESS

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Try changing the User that owns the service to Local System or use your admin account   Under services  I changed the Service SQL Server  MSSQLSERVER  Log On from NT Service Sql    To Local System  Right click the service and go to the Log On Tab and select the radio button Local System Account  You could also force another User to run it too if that fits better

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Goto Start -  Programs -  Microsoft SQL ServerYYYY -  Configuration Tools -  SQL Server YYYY Configuration Manager or run  SQLServerManager12 msc     Make sure that TCP IP is enabled under Client Protocols   Then go into  SQL Server Network Configuration  and double click TCP IP  Click the  IP Addresses  tab and scroll to the bottom  Under  IP All  remove TCP Dynamic Ports if it is present and set TCP Port to 1433  Click OK and then go back to  SQL Server Services  and restart SQL Server instance  Now you can connect via localhost  at least I could     Note that this error can of course occur when connecting from other applications as well  Example for a normal C  web application Web config connection string    lt connectionStrings gt       lt add name  DefaultConnection  connectionString  server localhost database myDb uid myUser password myPass     gt   lt  connectionStrings gt

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I had the same issue and I found that this happened after I installed an update for my SQL 2012  What fixed it for me was going into programs and features and running a repair on it

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First check SQL Server Service is Running or stopped  if it is stopped just start it  to do so  just follow the below steps   1 Start -  Run - Services msc     Go to Standard tab in services panel then search for SQl Server SQL2014        SQL2014  is given By me  it may be Another Name in your case     that s it once you start the SQL Service  you are able to connect local database   hope it will help someone

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in SQL SERVER EXPRESS 2012 you should use   localdb  MSSQLLocalDB  as Data Source name for example you can use connection string like this  Data Source  localdb  MSSQLLocalDB Initial Catalog master Integrated Security True

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This is odd I have a similar problem  I downloaded the package for SQL 2012 Express with Tools but the Database Engine was not install   I donloaded the other one from the MS site and this one installed the database engine   After a reboot the services were listed and ready to go

User · Answer

Try changing from windows authentication to mixed mode

[c#] Can't connect to localhost on SQL Server Express 2012 / 2016

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