Can't Connect to Localhost on SQL Server Express 2012/2016

Can't connect to localhost on SQL Server Express 2012 / 2016

According to Aaron Bertand:

1. You need to verify that the SQL Server service is running. You can do this by going to Start > Control Panel > Administrative Tools > Services, and checking that the service SQL Server (SQLEXPRESS) is running. If not, start it.

2. While you're in the services applet, also make sure that the service SQL Browser is started. If not, start it.

3. 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 > Programs > Microsoft SQL Server 2012 > 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.

   

4. 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:

5. otherwise, run Start -> Run -> 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.

Failing to connect to MSSQLSERVER

The name MSSQLSERVER is the default instance rather than the name of a named instance. Unlike a named instance (like the SQLEXPRESS instance), the instance name is not specified to connect to the default instance. One can connect to the default instance using the host name alone (assuming default 1433 port) or host name and port number. For a local connection, . or localhost can be specified.

SQL Server 2012 Express connection error

re-installing SQL was the only solution in my case. Learning is always attach 2-3 windows account with SQL Server.

Local server in SQL Server 2012 Management Studio

Ok, I've read that there might be a problem with connecting to database even if whole microsoft package gives me LocalDB. I had to install Visual Studio, then clicked View -> SQL Server Project Explorer. Right click at 'SQL Server', I added new database and then entered its name. Now I can connect with my own server by typing '(localdb)\v11.0' in management studio.

Can't connect to SQL Server Express via IP address - c#

I should have set the port and ip in server configuration manager.

SQL Server 2012: Login to PC-NAME\SQLEXPRESS works, but not to local/(local)

I've reinstalled it and ensures to select "default instance" instead of "named instance" during the installation. Now everything is fine again.

Unable to connect to Management Studio an error occured while connecting to the SQL Server

This is probably due to the fact that your Express edition is installed in a named instance and you aren't specifying it when connection to the database server.

You can see if it has a named instance by looking for the service in Services (under Administrative Tools).

The service will be called SQL Server (INSTANCE NAME).

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