Dear johnv2,
NoMachine should suit your needs out of the box without any additional server configuration. Please excuse the confusion caused by the EnableGSSAPIAuthentication key of our server’s config file. This key is obsolete and should no longer be used. This will be corrected in the upcoming 4.1 release.
And to answer your question – to use PAM with Kerberos in NoMachine the only steps you need to carry out are:
1) If you have already changed EnableGSSAPIAuthentication in server.cfg to 1, please change it back to 0 or comment it out. If you’ve just installed the server, you don’t have to do anything.
2) In the Player please be sure you’ve chosen NX protocol with password authorization.
3) Start the connection, enter your username and Kerberos password. That’s it. This procedure should have you authenticated with Kerberos using PAM.