TESTING REST WEB API on IIS 7 with NTLM and SOAP 5.2.1

Hello ,

I have REST WEB API service hosted in IIS 7.0 and it works based on windows authentication.

I could successfully test the API with SOAP UI 5.0.0 and NTLM authentication. But with the same settings SOAP UI 5.2.1 and SOAP UI 5.2.0 returns unauthorized error message. Could you please let me know if I need to change some settings?

Authenticate Premptively is Unchecked.

I tried with both Proxy Automatic and None.

Thanks,

Shambhu