The following cipher suites are enabled by default in Windows 7 and Windows Server R The Net Logon service maintains trust relationships and connections called secure channel between client computers and domain controllers in domains or between domain controllers in trusted domains.
In Windows Server R2 and Windows 7, NTLM-based minimum session security policy is set to require a minimum of bit encryption for both client computers and servers for new installations of the Windows operating system. This security policy requires that all network devices and operating systems that are using NTLM support bit encryption.
Existing session security is retained when you upgrade a Windows operating system from an earlier Windows version. These policies can be configured on computers running Windows Server R2 and Windows 7, which can affect NTLM usage on computers running earlier versions of Windows.
Introducing Extensions to the Negotiate Authentication Package. NegoExts NegoExts. This extension to the Negotiate package supports the following scenarios:.
Introducing Online Identity Integration. In Windows 7, users in a small network, such as a home network, can elect to share data, such as media files, between selected computers on a per-user basis. This feature complements the Homegroup feature in Windows 7 by using online IDs to identify individuals within the home networks. Users must explicitly link their Windows user account to an online ID to support this authentication.
Both the protocols are extremely secure and they are capable of authenticating clients without transmitting passwords over the network in any form, but they are limited. The NTLM authentication does not work across HTTP proxies because it requires a point-to-point connection between the Web browser and server in order to function properly. Kerberos authentication is only available on IE 5.
It works only on machines running Windows or higher and requires some additional ports to be open on firewalls. This response is called the challenge. The client then uses the challenge string and its password to calculate a response, which it transmits to the server. The server then validates the response it received from the client and compares it with the NTLM response. If the two values are identical, the authentication is successful. Kerberos is a ticket-based authentication protocol used by Windows computers that are members of an Active Directory domain.
Kerberos authentication is the best method for internal IIS installations. Windows and later implements Kerberos when Active Directory is deployed. The best part, it reduces the number of passwords each user has to memorize to use an entire network to one — the Kerberos password.
In addition, it incorporates encryption and message integrity to ensure that sensitive authentication data is never sent over the network in the clear. Each KDC contains a database of usernames and passwords for both users and Kerberos-enabled services. This is due to HTTP. When HTTP. If a single web server is configured to use Kernel Mode authentication, Kerberos will work without any additional configuration or additional SPNs because the server will automatically register a HOST SPN when it is added to the domain.
If multiple web servers are load balanced, the default Kernel Mode Authentication configuration will not work, or at least will intermittently fail, because the client has no way of ensuring the service ticket they received in the TGS request will work with the server authenticating the request. I highly recommend to check them out too for complete information around this Topic! Links below:. Until then, Happy SharePointing!! Check other Part links in this series too:. Part3: Troubleshooting Kerberos authentication and things to check when it fails.
Kerberos Survival Guide. Kerberos Authentication Demo. Kerberos Explained. Kerberos messages and tickets. Kerberos configuration known issues SharePoint Server Kerberos errors in network captures. View all posts by Vivek Malviya. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Skip to content.
Home Contact. Vivek Malviya Uncategorized March 21, 23 Minutes. SharePoint Server supports a variety of authentication methods and authentication providers for the following authentication types: Windows authentication , Forms-based authentication and SAML token-based authentication In this Post I will be talking about Windows authentication in SharePoint, but before we get there, In simple diagram, this is how Sharepoint Authentication takes place: Authentication is handled in Windows by a process called LSASS.
IIS supports the following modes of authentication: Anonymous. Although not a Windows authentication type, SharePoint Server also supports anonymous authentication. Users can access SharePoint content without validating their credentials. Anonymous authentication is disabled by default. Digest and Basic. With the Digest authentication method, the user account credentials are sent as an MD5 message digest to the Internet Information Services IIS service on the web server that hosts the web application or zone.
With the Basic authentication method, the user account credentials are sent as plaintext in an unencrypted Baseencoded format. Therefore, you should not use the Basic authentication method unless you are also using SSL to encrypt the website traffic.
Integrated Windows. The server negotiates with the client to determine the protocol to use. Kerberos authentication is used if the following conditions are met:. Kerberos v5 requires SPNs for multiple worker processes. If your Web site uses multiple worker processes, you can use Kerberos authentication, but you must manually register service names. For more information about Kerberos and service registration, see Kerberos and service registration later in this topic.
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