Specifies the version of the NTLM protocol to use when authenticating with Windows credentials. This setting is only applicable when AuthScheme=NTLM.

Possible Values

Data Type

string

Default Value

"1"

Remarks

This property allows you to control which version of the NTLM authentication protocol is used. Two versions are supported:

• 1 – NTLMv1: The original version of the NTLM protocol. It offers basic authentication support but is generally considered less secure.
• 2 – NTLMv2: A more secure and widely recommended version that includes enhanced session security and cryptographic protection.

Set this property to 2 to comply with modern security policies and Active Directory environments that require NTLMv2. Use 1 only if you are connecting to legacy systems that do not support NTLMv2.

Note: Some domain controllers may reject NTLMv1 requests due to security policy restrictions. If authentication fails with version 1, try setting NTLMVersion=2.