NWDS asks for OS logon ?

Hi

We are on NW7.4, I have installed NWDS and having issues when connecting to AS JAVA, NWDS asking for OS level user name.

I have red many threads and which are recommended to change service/protectedwebmethods in DEFAULT.PFL, I have tried with both options "DEFAULT" and "SDEFAULT" and restarted engine, but none of the solution works ?

Is there any other way to suppress OS logon ?

Thanks