title: Exception: .Net SqlClient Data Provider at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception,
body: <p>I m doing sitecore 7.0 Installation with installer ...but every time on database setup it throws same error :</p>
  
  <blockquote>
    <p>Exception:  .Net SqlClient Data Provider</p>
    
    <p>at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException
    exception, Boolean breakConnection, Action<code>1 wrapCloseInAction)    at
    System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject
    stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)    at
    System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior,
    SqlCommand cmdHandler, SqlDataReader dataStream,
    BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject
    stateObj, Boolean&amp; dataReady)    at
    System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior,
    SqlCommand cmdHandler, SqlDataReader dataStream,
    BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject
    stateObj)    at
    System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean
    enlistOK)    at
    System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo
    serverInfo, String newPassword, SecureString newSecurePassword,
    Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean
    withFailover)    at
    System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo
    serverInfo, String newPassword, SecureString newSecurePassword,
    Boolean redirectedUserInstance, SqlConnectionString connectionOptions,
    SqlCredential credential, TimeoutTimer timeout)    at
    System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer
    timeout, SqlConnectionString connectionOptions, SqlCredential
    credential, String newPassword, SecureString newSecurePassword,
    Boolean redirectedUserInstance)    at
    System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity
    identity, SqlConnectionString connectionOptions, SqlCredential
    credential, Object providerInfo, String newPassword, SecureString
    newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString
    userConnectionOptions)    at
    System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions
    options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo,
    DbConnectionPool pool, DbConnection owningConnection,
    DbConnectionOptions userOptions)    at
    System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool
    pool, DbConnectionOptions options, DbConnectionPoolKey poolKey,
    DbConnectionOptions userOptions)    at
    System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnectionOptions
    userOptions)    at
    System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnectionOptions
    userOptions)    at
    System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection
    owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean
    allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions
    userOptions, DbConnectionInternal&amp; connection)    at
    System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection
    owningObject, TaskCompletionSource</code>1 retry, DbConnectionOptions
    userOptions, DbConnectionInternal&amp; connection)    at
    System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection
    owningConnection, TaskCompletionSource<code>1 retry, DbConnectionOptions
    userOptions, DbConnectionInternal&amp; connection)    at
    System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection
    outerConnection, DbConnectionFactory connectionFactory,
    TaskCompletionSource</code>1 retry, DbConnectionOptions userOptions)    at
    System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1
    retry)    at System.Data.SqlClient.SqlConnection.Open()    at
    SitecoreInstallWizardCore.Utils.SQLUtil.TestSqlServerConnection(String
    connectionString, String userName, Boolean verifyUserSysadmin, Boolean
    verifyInstanceLocal)</p>
  </blockquote>
  
  <p>thing i tried :</p>
  
  <ul>
  <li>diffrent login credentials on sql server / window authentication ..</li>
  <li>clean up all cache in temp
  <ul>
  <li>installed mvc 3 and 4</li>
  </ul></li>
  </ul>
  
  <p>still the installer says given error with above error</p>
  
  <blockquote>
    <p>An error occured while attempting to connect to SQL Server: Login
    failed for user ' '. See the log file for details.</p>
  </blockquote>
  
  <p>i googled , but couldnt find much relevant regarding  sitecore ...
  please suggest</p>