[SoapUI] NTLM with different domain users

Hello,

I'm trying to call a REST web-service with NTLM authentication hosted on a IIS server.
Using an account from an other domain (different from the session account and computer domain), I get a "401 Unauthorized" response from server with SoapUI versions 5.4 and 5.3, whereas the request returns "200 Success" using version 5.0.0. All these versions have the same preferences.
Using the session account or other having the session's account domain, response is "200 Success" with all three versions.
Tests was made on both Windows 10 and Windows 7, and the same result is visible in each case.

Did the authentication system change since version 5.0.0 ? Did I miss an option or configuration in the latest versions ?

Regards.