Troubleshooting NTLM2 authentication

Hi,

I am trying to get SOAP UI to function against a WCF service that has NTLM configured as its authentication mechanism.  I am able to use Fiddler to properly interact with the web service, but SOAP UI does not work at all with it.  The only way I can get it to work is if Fiddler is running, presumably as a proxy, and then it runs fine.  Once I shutdown Fiddler it stops running.  I am not sure what is going on here, although I do see security failures with an unknown user name password / null sid errors on the server where the service is hosted.

What might be going on here.