Since some time it seems the NtlmAuthenticator of RestSharp is deprecated. The somewhere mentioned method of setting setting.UseDefaultCredentials = true; isn't available either.
So how can I use NTLM or Kerberos with RestSharp?
AND NO! I cannot say the other program, that I want to use LDAP or OAuth2.0 or whatever you think is appropriate. I have a program that says: "I have an API and you can authorize by LDAP/Kerberos and then you get data!" and I am not the programmer of that API.
Has anyone an idea of how to get my data with the newer versions of RestSharp or do I have to go back to old versions?
Both Credentials and UseDefaultCredentials are available, unlike you said, in RestClientOptions:
/// <summary>
/// In general you would not need to set this directly. Used by the NtlmAuthenticator.
/// </summary>
public ICredentials? Credentials { get; set; }
/// <summary>
/// Determine whether or not the "default credentials" (e.g. the user account under which the current process is
/// running) will be sent along to the server. The default is false.
/// </summary>
public bool UseDefaultCredentials { get; set; }