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This behavior is problematic for connections to Azure SQL databases, which often fail with transient errors that are typically recovered from within a few seconds. For more information, see SQL Server Connection Pooling (ADO.NET). NET Framework 4.6.1 and earlier versions, when an app encounters a transient connection failure when connecting to a database, the connection attempt cannot be retried quickly, because the connection pool caches the error and re-throws it for 5 seconds to 1 minute.
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For all other connection attempts, the connection pool blocking period continues to be enforced. This change allows the connection open attempt to be retried immediately for Azure SQL databases, thereby improving the performance of cloud- enabled apps. Attempts to retry connection open requests will occur almost immediately after transient connection errors. NET Framework 4.6.2, for connection open requests to known Azure SQL databases (*., *., *., *.), the connection pool blocking period is removed, and connection open errors are not cached. Connection pool blocking period for Azure SQL databases is removed Details
#Microsoft net 4.6.2 offline upgrade
To connect to a SQL Server database that resolves to localhost, upgrade to the. This issue has been addressed and the previous behavior restored in the. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" Suggestion 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.
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NET Framework 4.6 and 4.6.1, attempting a TCP/IP connection to a SQL Server database that resolves to localhost fails with the error, "A network-related or instance-specific error occurred while establishing a connection to SQL Server. NET Framework 4.6.1 to 4.6.2, review the following topics for application compatibility issues that may affect your app: Data Attempting a TCP/IP connection to a SQL Server database that resolves to localhost fails Details