NTLM

NTLM authentication is required in networks where the server receives requests from clients that do not support Kerberos authentication.

To determine whether your firewall server allows for NTLM authentication, see the product documentation for your firewall product.

We recommend that you use NTLM authentication for your Outlook Anywhere deployment.

Kerberos V5 and NTLM are used for server authentication, which verifies a Message Queuing server to a client.

Set the authentication method for this virtual directory to Integrated Windows Authentication (formerly NTLM authentication).

For more information about whether you can use NTLM with your firewall, see your firewall manufacturer's documentation.

In each of these scenarios, the issue is that the HTTP endpoint will fall back to NTLM authentication until the issue is resolved.

The following table illustrates some of the differences between Basic authentication and NTLM authentication.

If there is a firewall, ensure that the SMTP Command Filters on the firewall do not filter the AUTH NTLM command.

IP gateways do not support either NTLM or Kerberos authentication.

NTLM authentication is also known as Integrated Windows authentication.

NTLM authentication fails if the RPC proxy server does not trust the authentication information.

The Negotiate protocol selects either NTLM or Kerberos depending on the security protocols supported by the client and server.

After a few seconds, it will pop up a small window of "NTLM Authentication" .

IIS authenticates the HTTP request using Basic authentication or NTLM authentication, depending on the Outlook profile setting.

In Exchange 2000, the default authentication for Exchange Virtual Servers was the NTLM protocol.

In this example, the IIS server has a hashed version of the password as a result of using NTLM.

The user automatically sends NTLM authentication information with the connection.

The default, NEGOTIATE, causes the endpoint to use the Windows negotiation protocol to choose either NTLM or Kerberos.

IIS authenticates the client using basic, digest, or Windows integrated security (NTLM or Kerberos).

Additionally, this article contains information about how to switch from Kerberos authentication back to NTLM authentication.

Using the NTLM protocol, user names and passwords are encrypted and are then passed to the SMTP virtual server for authentication purposes.

Indicates a SID present when the Microsoft NTLM authentication package authenticated the client.

By using NTLM authentication, the user's credentials are not sent over the network.

For HTTP authentication where "Negotiate" is listed, Kerberos is tried first, and then NTLM is tried.

NTLM is implemented in Windows 2000 and later versions by a Security Support Provider Interface (SSPI).

This requires that the server can support NTLM or Basic authentication.

Indicates a negotiation mechanism (Sicily) will be used to choose MSN, DPA or NTLM.

To select the type of authentication, you must set your Outlook profile to use either Basic authentication or NTLM authentication.

Clients may use Kerberos or NTLM to authenticate with the Receive connector.

Outlook always uses NTLM authentication for the RPC request.

Accepts an endpoint certificate or for NTLM authentication.

The authentication method can be set to Basic or NTLM or both.

Clients may only use NTLM to authenticate with the Receive connector.

By default, only basic, digest, and NTLM authentication schemes are supported in HttpClient.

The second option allows the endpoint to support both NTLM and Kerberos authentication.

When this flag is set, the WinNT provider uses NTLM to authenticate the client.

Windows NTLM authentication will be selected by default.

If you are using a firewall that does not handle NTLM, you must use Basic authentication over SSL.

If you run the Remote Debugger under another account, it can use NTLM authentication, which does not require DNS.

NTLM can also use the current Microsoft Windows operating system logon information.

Even though it is more secure, NTLM may not work with firewalls that examine and modify traffic.

If you are using NTLM and you are using an incorrect configuration.

If defaultCredentials is true, Kerberos or NTLM will be used if the server supports these protocols.

If the Exchange Business Logic layer consumer is not running as Local System, the authentication method is NTLM.

When mail submission is remote, NTLM authentication is used.

For example, you may expect a Kerberos or NTLM authentication challenge from the server but instead you may receive a Basic challenge.

Specifically, on a Windows Server 2003 cluster, enabling NTLMv2 authentication for NTLM SSP prevents the Cluster service from starting.

The RPC requests that the Exchange server authenticates always use NTLM authentication.

For example, when an Administrator runs an Exchange Management Shell cmdlet that uses the Exchange Business Logic layer, NTLM is used.

Windows NTLM support, providing easy enterprise-wide single sign on against Windows corporate networks

When using non-default NTLM authentication, the application sets the authentication type to NTLM and uses a

Heavy NTLM Authentication Traffic Occurs Between Internet Explorer and the Proxy Server

To use a script to enable NTLM authentication on the virtual server, follow these steps

To enable NTLM authentication on the virtual server, type the following command, and then press ENTER

NTLM authentication may stop unexpectedly in Windows 2000

You should consider using a more secure authentication mechanism, such as Kerberos or NT LAN Manager (NTLM. )

NTLM Authentication Over an SSL Connection Does Not Work in Internet Explorer 6