How do you fix a double hop issue?
Restart the SQL Server Instances. This causes a SPN to be created (Service Principal Name) for each instance. Once this is done a “Delegation” tab will be visible in AD for each of the service accounts. Grant both of your service accounts “Trust this user for delegation to any service (Kerberos only)”.
What is double hop issue in SQL Server?
Double hop issues are when you have a client connect to one SQL Server and that server needs to pull data from another SQL Server. The first server uses Windows Authentication credentials on the second server and the connection to the first SQL Server is made using Kerberos authentication.
What is Kerberos double hop?
Kerberos Double Hop is a term used to describe our method of maintaining the client’s Kerberos authentication credentials over two or more connections. In this fashion we can retain the user’s credentials and act on behalf of the user in further connections to other servers.
What is the use of SPN in SQL Server?
SPNs are used by the authentication protocol to determine the account in which a SQL Server instance runs. If the instance account is known, Kerberos authentication can be used to provide mutual authentication by the client and server.
What is SSPI context?
The Security Support Provider Interface (SSPI) is the interface to Microsoft Windows NT security that is used for Kerberos authentication, and supports the authentication scheme of the NTLM Security Support Provider. Authentication occurs at the operating system level when you log on to a Windows domain.
What is NTLM authentication in SQL Server?
NTLM Authentication: Challenge- Response mechanism. In the NTLM protocol, the client sends the user name to the server; the server generates and sends a challenge to the client; the client encrypts that challenge using the user’s password; and the client sends a response to the server.
Where do you run setspn?
It is available if you have the Active Directory Domain Services (AD DS) server role installed. To use setspn, you must run the setspn command from an elevated command prompt. To open an elevated command prompt, click Start, right-click Command Prompt, and then click Run as administrator.
Who can run setspn?
SetSPN is free, and it is already installed on your Windows PC or Server. You can run SetSPN from member servers or workstations. It can be used to add Service Principal Names to an AD account, as well as delete them and search for duplicate SPNs that are in the domain.
Can not generate SSPI context SQL Server?
The “Cannot generate SSPI context” error is generated when SSPI uses Kerberos authentication to delegate over TCP/IP and Kerberos authentication cannot complete the necessary operations to successfully delegate the user security token to the destination computer that is running SQL Server.
What is the second hop in SQL Server Authentication?
If the authentication uses a SQL Server login then there is no second “hop”. The user and password specified by the linked server are used to authenticate to the target server. If however, the authentication involves an active directory account, then things get a bit more complicated.
Why can’t I connect to the IIS server with integrated authentication?
The reason is because of a ‘double hop’ that authentication is doing. When you authenticate to the IIS server using Integrated Authentication, that uses up your first ‘hop’. When IIS tries to access a network device, that would be the double or second hop which is not allowed.
Kerberos Double Hop is a term used to describe our method of maintaining the client’s Kerberos authentication credentials over two or more connections. In this fashion we can retain the user’s credentials and act on behalf of the user in further connections to other servers.
How to authenticate to a 2nd instance of SQL Server?
The complication comes in when after connecting to this remote instance of SQL Server, the user wishes to authenticate to a 2nd instance of SQL Server. This is the 2nd “Hop”. User Computer >HOP> SQL Server A > HOP > SQL Server B