- #SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD DRIVER#
- #SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD SOFTWARE#
- #SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD CODE#
- #SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD WINDOWS#
#SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD DRIVER#
When the SQL Server driver forms an invalid SPN, authentication still works because the SSPI interface tries to look up the SPN in the Active Directory service. Therefore, issues resolving the IP address or the host name to a fully qualified DNS by WinSock may cause the SQL Server driver to create an invalid SPN for the server.įor example, the client-side SQL Server driver can be used as a fully qualified DNS to resolve invalid SPNs as follows: When the SQL Server driver on the client resolves the fully qualified DNS of the server, the corresponding DNS is used to form the SPN for the server. If integrated security is used, the driver will try to resolve the server's fully qualified DNS even if an IP address or a host name is passed as the name of the server.
#SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD CODE#
To perform this operation, the driver code calls the gethostbyname and gethostbyaddr WinSock APIs.
#SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD WINDOWS#
The SQL Server driver code on the client uses the WinSock network API to resolve the fully qualified DNS of the server when the driver uses Windows authentication to connect to SQL Server. Why doesn't the connection fail over to NTLM after running into issues with Kerberos? In other words, Windows uses Kerberos delegation if the destination computer running SQL Server has an associated and correctly configured SPN. In this context, "negotiate" means to try Kerberos or NTLM authentication on Windows-based computers. This process notifies the underlying security provider to negotiate delegation. The SQL Server network client makes a call to the AcquireCredentialsHandle function and passes in "negotiate" for the pszPackage parameter. When a SQL Server client uses integrated security over TCP/IP sockets to a remote server that's running SQL Server, the SQL Server client network library uses the SSPI API to perform security delegation. Clients that use Windows authentication are authenticated by using NTLM or Kerberos. Windows authentication is the preferred method for users to authenticate to SQL Server. Why does SSPI use NTLM or Kerberos authentication? For more information about registering SQL Server Service SPNs, see Register a Service Principal Name for Kerberos Connections. The port number is what ties the SPN to a particular instance. The format of an SPN for a default instance is the same as an SPN for a named instance. This association process allows a client application to request the service to authenticate an account even if the client doesn't have an account name.įor example, a typical SPN for a server that is running an instance of SQL Server is as follows: SPNs are used by Kerberos authentication to associate a service instance with a service logon account. What is SPN?Ī Service Principal Names (SPN) is a unique identifier of a service instance. In most cases, a misconfigured Service Principal Name (SPN) causes this error. This error means that SSPI tries but can't use Kerberos authentication to delegate client credentials through TCP/IP or Named Pipes to SQL Server. What does the "Cannot generate SSPI context" error mean? For more information, see Security Support Providers (SSPs). Kerberos v5 protocol is an industry-standard security package and is one of the three security packages in Windows operating systems. Each module is called a Security Support Provider (SSP) and is implemented as a Dynamic Link Library (DLL).
#SQL SERVER CLIENT NETWORK UTILITY 2008 DOWNLOAD SOFTWARE#
One or more software modules provide the actual authentication capabilities. Security Support Provider Interface (SSPI) is a set of Windows APIs that allows delegation and mutual authentication over any generic data transport layer, such as TCP/IP sockets. When you use Windows authentication to connect a SQL Server instance remotely, you receive the following error message: Before you start troubleshooting, we recommend that you check the prerequisites and go through the checklist.
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