If you have the permission to manipulate cluster resources, the more recommended approach is to set the network name of your availability group listener to RegisterAllProvidersIP=0. Pros: If a cross-subnet failover occurs, client recovery time is short.Ĭons: Half of the client connections will take more than 20 seconds
#SQL SERVER CONNECTION STRING NAMED INSTANCE PLUS#
If do not have the permission to manipulate cluster resources, change your connection timeout to 30 seconds (this value results in a 20-second TCP timeout period plus a 10-second buffer). Workarounds: We recommend that you do one of the following tasks. NET Framework 3.5SP1 or SQL Native Client 11.0 OLEDB, potentially 50% of your client-connection requests to the availability group listener will hit a connection timeout. Issue: If your Availability Group or Failover Cluster Instance has a listener name (known as the network name or Client Access Point in the WSFC Cluster Manager) depending on multiple IP addresses from different subnets, and you are using either ADO.NET with. MultiSubnetFailover=True Not Supported by NET Framework 3.5 or OLEDB This is to add named instance resolution support for an AlwaysOn Failover Cluster Instances with multiple subnet endpoints. Named instance resolution to a multi-subnet AlwaysOn Failover Cluster Instance. This performs more aggressive TCP connection retries to speed up single subnet failovers. This feature is used when connecting to a listener that has a single IP in a single subnet. The following three sub-features are enabled when MultiSubnetFailover=True is set in connection string:įaster multi-subnet failover to a multi-subnet listener for an AlwaysOn Availability Group or Failover Cluster Instances.įaster single subnet failover to a single subnet listener for an AlwaysOn Availability Group or Failover Cluster Instances.
" at .ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling, String accessToken)Īt .CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions)Īt .CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions)Īt .CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)Īt .UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection)Īt .TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)Īt .TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)Īt .TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)Īt .TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)Īt .TryOpen(TaskCompletionSource`1 retry)Īt .Open()Īt () in C:\Visual Studio 2017\Projects\NewSqlClientCacheEngine\SqlClientStandard\DataLayerClass.cs:line 12Īt (String args) in C:\Visual Studio 2017\Projects\NewSqlClientCacheEngine\TestCoreConsoleApp1\Program.cs:line 7"Ĭommon data layer project (.MultiSubnetFailover is a new connection string keyword used to enable faster failover with AlwaysOn Availability Groups and AlwaysOn Failover Cluster Instances in SQL Server 2012.
(provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" Verify that the instance name is correct and that SQL Server is configured to allow remote connections. The server was not found or was not accessible. "A network-related or instance-specific error occurred while establishing a connection to SQL Server.