[SqlException (0x80131904): 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: TCP Provider, error: 0 - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.)]
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +578
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +88
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +6343479
System.Data.SqlClient.SqlConnection.Open() +258
Microsoft.SharePoint.Utilities.SqlSession.OpenConnection() +27937767
Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior, SqlQueryData monitoringData, Boolean retryForDeadLock) +253
Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, Boolean retryForDeadLock) +110
Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command) +52
Microsoft.SharePoint.Upgrade.SPDatabaseSequence.GetVersion(SPDatabase database, Guid id, Version defaultVersion, SqlSession session, SPDatabaseSequence sequence) +495
Microsoft.SharePoint.Upgrade.SPDatabaseSequence.get_SchemaVersion() +380
Microsoft.SharePoint.Upgrade.SPSequence.get_IsBackwardsCompatible() +92
Microsoft.SharePoint.Upgrade.SPUpgradeSession.IsBackwardsCompatible(Object o, Boolean bRecurse) +24905100
Microsoft.SharePoint.Administration.SPPersistedUpgradableObject.get_IsBackwardsCompatible() +59
Microsoft.SharePoint.Administration.SPPersistedUpgradableObject.ValidateBackwardsCompatibility() +170
Microsoft.SharePoint.SPSite.PreinitializeServer(SPRequest request) +63
Microsoft.SharePoint.SPWeb.InitializeSPRequest() +258
Microsoft.SharePoint.WebControls.SPControl.EnsureSPWebRequest(SPWeb web) +365
Microsoft.SharePoint.WebControls.SPControl.SPWebEnsureSPControl(HttpContext context) +520
Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.GetContextWeb(HttpContext context) +27
Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.PostResolveRequestCacheHandler(Object oSender, EventArgs ea) +918
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171
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