Sql-server – Can no longer login to SQL Server 2008 R2

sql serversql-server-2008

Not sure what might have caused it, I ended task on some SQL processes in task manager then restarted the computer. Now I can no longer login to SQL Server 2008 R2. This is the error I get when attempting to login:

==================================

Cannot connect to JSMITH.

===================================

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)
(.Net SqlClient Data Provider)

—————————— For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=2&LinkId=20476

—————————— Error Number: 2 Severity: 20 State: 0

—————————— Program Location:

at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException
exception, Boolean breakConnection) at
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject
stateObj) at System.Data.SqlClient.TdsParser.Connect(ServerInfo
serverInfo, SqlInternalConnectionTds connHandler, Boolean
ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean
trustServerCert, Boolean integratedSecurity, SqlConnection
owningObject) at
System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo
serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64
timerExpire, SqlConnection owningObject) at
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String
host, String newPassword, Boolean redirectedUserInstance,
SqlConnection owningObject, SqlConnectionString connectionOptions,
Int64 timerStart) at
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection
owningObject, SqlConnectionString connectionOptions, String
newPassword, Boolean redirectedUserInstance) at
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity
identity, SqlConnectionString connectionOptions, Object providerInfo,
String newPassword, SqlConnection owningObject, Boolean
redirectedUserInstance) at
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions
options, Object poolGroupProviderInfo, DbConnectionPool pool,
DbConnection owningConnection) at
System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection
owningConnection, DbConnectionPoolGroup poolGroup) at
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection
owningConnection) at
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection
outerConnection, DbConnectionFactory connectionFactory) at
System.Data.SqlClient.SqlConnection.Open() at
Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo
ci, IServerType server) at
Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser()

Best Answer

I would suggest to check the following:

Check if SQL Server service is running, if not check EventLog for any service-related errors.
Check that names pipes are enabled in Config Manager. You also might want to try switching to using TCP/IP instead. If you're switching to TCP/IP, you'll need to make sure that SQL Server Browser service is enabled/running as well.

Syntax:

ALTER TABLE {TABLENAME} 
ADD {COLUMNNAME} {TYPE} {NULL|NOT NULL} 
CONSTRAINT {CONSTRAINT_NAME} DEFAULT {DEFAULT_VALUE}
WITH VALUES

Example:

ALTER TABLE SomeTable
        ADD SomeCol Bit NULL --Or NOT NULL.
 CONSTRAINT D_SomeTable_SomeCol --When Omitted a Default-Constraint Name is autogenerated.
    DEFAULT (0)--Optional Default-Constraint.
WITH VALUES --Add if Column is Nullable and you want the Default Value for Existing Records.

Notes:

Optional Constraint Name:
If you leave out CONSTRAINT D_SomeTable_SomeCol then SQL Server will autogenerate
a Default-Contraint with a funny Name like: DF__SomeTa__SomeC__4FB7FEF6

Optional With-Values Statement:
The WITH VALUES is only needed when your Column is Nullable
and you want the Default Value used for Existing Records.
If your Column is NOT NULL, then it will automatically use the Default Value
for all Existing Records, whether you specify WITH VALUES or not.

How Inserts work with a Default-Constraint:
If you insert a Record into SomeTable and do not Specify SomeCol's value, then it will Default to 0.
If you insert a Record and Specify SomeCol's value as NULL (and your column allows nulls),
then the Default-Constraint will not be used and NULL will be inserted as the Value.

Notes were based on everyone's great feedback below.
Special Thanks to:
@Yatrix, @WalterStabosz, @YahooSerious, and @StackMan for their Comments.

Sql – Application Role connect to SQL Server with “Login Failed” error

The error message really says it all:

SqlException was unhandled by user code 
Message="Login failed for user 'domain\username'." 
Source=".Net SqlClient Data Provider" ErrorCode=-2146232060 Class=14

From this, you should see that the user the you use to connect to your ServerB does not have an account on that second server, obviously.

It has nothing to do with your application role or whatever - your user "domain\username" just simply doesn't have access rights to the second server.

Add a login for that user, and grant him access and the necessary permissions on the databases needed, and you should be fine.

Marc

Best Answer

Related Solutions

Sql – Add a column with a default value to an existing table in SQL Server

Syntax:

Example:

Notes:

Sql – Application Role connect to SQL Server with “Login Failed” error

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