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1 | 1 | --- |
2 | 2 | title: "Driver and client connectivity support for availability groups" |
3 | 3 | description: "This topic describes considerations for client connectivity to Always On availability groups, including prerequisites, restrictions, and recommendations for client configurations and settings. " |
4 | | -ms.custom: "seodec18" |
5 | | -ms.date: "07/28/2020" |
| 4 | +author: MashaMSFT |
| 5 | +ms.author: mathoma |
| 6 | +ms.reviewer: randolphwest |
| 7 | +ms.date: 07/29/2022 |
6 | 8 | ms.prod: sql |
7 | | -ms.reviewer: "" |
8 | 9 | ms.technology: availability-groups |
9 | 10 | ms.topic: conceptual |
10 | | -helpviewer_keywords: |
| 11 | +ms.custom: seodec18 |
| 12 | +helpviewer_keywords: |
11 | 13 | - "Availability Groups [SQL Server], listeners" |
12 | 14 | - "Availability Groups [SQL Server], prerequisites and restrictions" |
13 | 15 | - "Availability Groups [SQL Server], client connectivity" |
14 | | -ms.assetid: b456448d-1757-48c8-8bbb-2d1c2d6d61e9 |
15 | | -author: MashaMSFT |
16 | | -ms.author: mathoma |
17 | 16 | --- |
18 | 17 | # Driver and client connectivity support for availability groups |
| 18 | + |
19 | 19 | [!INCLUDE [SQL Server](../../../includes/applies-to-version/sqlserver.md)] |
20 | 20 |
|
21 | | - This topic describes considerations for client connectivity to Always On availability groups, including prerequisites, restrictions, and recommendations for client configurations and settings. |
22 | | - |
23 | | - |
24 | | -## <a name="ClientConnSupport"></a> Client Connectivity Support |
25 | | - The section below provides information about [!INCLUDE[ssHADR](../../../includes/sshadr-md.md)] support for client connectivity. |
26 | | - |
27 | | - **Driver Support** |
28 | | - |
29 | | - The following table summarizes driver support for [!INCLUDE[ssHADR](../../../includes/sshadr-md.md)]: |
30 | | - |
31 | | -|Driver|Multi-Subnet Failover|Application Intent|Read-Only Routing|Multi-Subnet Failover: Faster Single Subnet Endpoint Failover|Multi-Subnet Failover: Named Instance Resolution For SQL Clustered Instances| |
| 21 | +This article describes considerations for client connectivity to Always On availability groups, including prerequisites, restrictions, and recommendations for client configurations and settings. |
| 22 | + |
| 23 | +## Client connectivity support |
| 24 | + |
| 25 | +The section below provides information about [!INCLUDE[ssHADR](../../../includes/sshadr-md.md)] support for client connectivity. |
| 26 | + |
| 27 | +### Driver support |
| 28 | + |
| 29 | +The following table summarizes driver support for [!INCLUDE[ssHADR](../../../includes/sshadr-md.md)]: |
| 30 | + |
| 31 | +|Driver|Multi-subnet failover|Application intent|Read-only routing|Multi-subnet failover: faster single subnet endpoint failover|Multi-subnet failover: named instance resolution for SQL clustered instances| |
32 | 32 | |------------|----------------------------|------------------------|------------------------|--------------------------------------------------------------------|-----------------------------------------------------------------------------------| |
33 | 33 | |SQL Native Client 11.0 ODBC|Yes|Yes|Yes|Yes|Yes| |
34 | 34 | |SQL Native Client 11.0 OLEDB|No|Yes|Yes|No|No| |
35 | | -|ADO.NET with .NET Framework 4.0 with connectivity patch*|Yes|Yes|Yes|Yes|Yes| |
36 | | -|ADO.NET with .NET Framework 3.5 SP1 with connectivity patch**|Yes|Yes|Yes|Yes|Yes| |
| 35 | +|ADO.NET with .NET Framework 4.0 with connectivity patch <sup>1</sup>|Yes|Yes|Yes|Yes|Yes| |
| 36 | +|ADO.NET with .NET Framework 3.5 SP1 with connectivity patch <sup>2</sup>|Yes|Yes|Yes|Yes|Yes| |
37 | 37 | |[Microsoft ODBC Driver 13.1+ for SQL Server](../../../connect/odbc/microsoft-odbc-driver-for-sql-server.md)|Yes|Yes|Yes|Yes|Yes| |
38 | | -|[Microsoft JDBC Driver 4.0+ for SQL Server](../../../connect/jdbc/microsoft-jdbc-driver-for-sql-server.md)|Yes|Yes|Yes|Yes|Yes| |
39 | | -|[Microsoft OLE DB Driver for SQL Server](../../../connect/oledb/oledb-driver-for-sql-server.md)|Yes|Yes|Yes|Yes|Yes| |
40 | | - |
41 | | - *Download the connectivity patch for ADO .NET with .NET Framework 4.0: [https://support.microsoft.com/kb/2600211](https://support.microsoft.com/kb/2600211). |
42 | | - |
43 | | - **Download the connectivity patch for ADO.NET with .NET Framework 3.5 SP1: [https://support.microsoft.com/kb/2654347](https://support.microsoft.com/kb/2654347). |
44 | | - |
45 | | - *Download the new Microsoft OLE DB Driver for SQL Server: [https://aka.ms/downloadmsoledbsql](../../../connect/oledb/download-oledb-driver-for-sql-server.md). |
| 38 | +|[Microsoft JDBC Driver 4.0+ for SQL Server](../../../connect/jdbc/microsoft-jdbc-driver-for-sql-server.md)|Yes|Yes|Yes|Yes|Yes| |
| 39 | +|[Microsoft OLE DB Driver for SQL Server](../../../connect/oledb/oledb-driver-for-sql-server.md) <sup>3</sup>|Yes|Yes|Yes|Yes|Yes| |
| 40 | + |
| 41 | +<sup>1</sup> Download the connectivity patch for ADO .NET with .NET Framework 4.0: [https://support.microsoft.com/kb/2600211](https://support.microsoft.com/kb/2600211). |
| 42 | + |
| 43 | +<sup>2</sup> Download the connectivity patch for ADO.NET with .NET Framework 3.5 SP1: [https://support.microsoft.com/kb/2654347](https://support.microsoft.com/kb/2654347). |
| 44 | + |
| 45 | +<sup>3</sup> Download Microsoft OLE DB Driver for SQL Server: [https://aka.ms/downloadmsoledbsql](../../../connect/oledb/download-oledb-driver-for-sql-server.md). |
46 | 46 |
|
47 | 47 | > [!IMPORTANT] |
48 | | -> To connect to an availability group listener, a client must use a TCP connection string. |
49 | | - |
50 | | -## <a name="RelatedTasks"></a> Related Tasks |
51 | | - |
52 | | -- [Creation and Configuration of Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/creation-and-configuration-of-availability-groups-sql-server.md) |
53 | | - |
54 | | -- [Create or Configure an Availability Group Listener (SQL Server)](../../../database-engine/availability-groups/windows/create-or-configure-an-availability-group-listener-sql-server.md) |
55 | | - |
56 | | -## See Also |
57 | | - [Overview of Always On Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/overview-of-always-on-availability-groups-sql-server.md) |
58 | | - [Failover Clustering and Always On Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/failover-clustering-and-always-on-availability-groups-sql-server.md) |
59 | | - [Prerequisites, Restrictions, and Recommendations for Always On Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/prereqs-restrictions-recommendations-always-on-availability.md) |
60 | | - [Availability Group Listeners, Client Connectivity, and Application Failover (SQL Server)](../../../database-engine/availability-groups/windows/listeners-client-connectivity-application-failover.md) |
61 | | - [About Client Connection Access to Availability Replicas (SQL Server)](../../../database-engine/availability-groups/windows/about-client-connection-access-to-availability-replicas-sql-server.md) |
62 | | - [Microsoft SQL Server Always On Solutions Guide for High Availability and Disaster Recovery](/previous-versions/sql/sql-server-2012/hh781257(v=msdn.10)) |
63 | | - [SQL Server Always On Team Blog: The official SQL Server Always On Team Blog](/archive/blogs/sqlalwayson/) |
64 | | - [A long time delay occurs when you reconnect an IPSec connection from a computer that is running Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2](https://support.microsoft.com/kb/980915) |
65 | | - [The Cluster service takes about 30 seconds to fail over IPv6 IP addresses in Windows Server 2008 R2](https://support.microsoft.com/en-us/topic/the-cluster-service-takes-about-30-seconds-to-fail-over-ipv6-ip-addresses-in-windows-server-2008-09a35200-9816-b8eb-fa14-2746894ac0d1) |
66 | | - [Slow failover operation if no router exists between the cluster and an application server](https://support.microsoft.com/kb/2582281) |
67 | | - |
| 48 | +> To connect to an availability group listener, a client must use a TCP connection string. |
| 49 | +
|
| 50 | +## Next steps |
| 51 | + |
| 52 | +- [Creation and Configuration of Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/creation-and-configuration-of-availability-groups-sql-server.md) |
| 53 | +- [Create or Configure an Availability Group Listener (SQL Server)](../../../database-engine/availability-groups/windows/create-or-configure-an-availability-group-listener-sql-server.md) |
| 54 | + |
| 55 | +## See also |
| 56 | + |
| 57 | +- [Overview of Always On Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/overview-of-always-on-availability-groups-sql-server.md) |
| 58 | +- [Failover Clustering and Always On Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/failover-clustering-and-always-on-availability-groups-sql-server.md) |
| 59 | +- [Prerequisites, Restrictions, and Recommendations for Always On Availability Groups (SQL Server)](../../../database-engine/availability-groups/windows/prereqs-restrictions-recommendations-always-on-availability.md) |
| 60 | +- [Availability Group Listeners, Client Connectivity, and Application Failover (SQL Server)](../../../database-engine/availability-groups/windows/listeners-client-connectivity-application-failover.md) |
| 61 | +- [About Client Connection Access to Availability Replicas (SQL Server)](../../../database-engine/availability-groups/windows/about-client-connection-access-to-availability-replicas-sql-server.md) |
| 62 | +- [Microsoft SQL Server Always On Solutions Guide for High Availability and Disaster Recovery](/previous-versions/sql/sql-server-2012/hh781257(v=msdn.10)) |
| 63 | +- [SQL Server Always On Team Blog: The official SQL Server Always On Team Blog](/archive/blogs/sqlalwayson/) |
| 64 | +- [A long time delay occurs when you reconnect an IPSec connection from a computer that is running Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2](https://support.microsoft.com/kb/980915) |
| 65 | +- [The Cluster service takes about 30 seconds to fail over IPv6 IP addresses in Windows Server 2008 R2](https://support.microsoft.com/en-us/topic/the-cluster-service-takes-about-30-seconds-to-fail-over-ipv6-ip-addresses-in-windows-server-2008-09a35200-9816-b8eb-fa14-2746894ac0d1) |
| 66 | +- [Slow failover operation if no router exists between the cluster and an application server](https://support.microsoft.com/kb/2582281) |
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