I found an easier way to go about this nagging problem. Register GlassFish Server without setting user/password the first time. Then right click GlassFish then to View Domain Admin Console. On the Glassfish admin page that appears, you will see Change Administrator Password under Administration on the GlassFish Console- Common Tasks. Click to set your password by changing the default password. The user is admin but the password is up to you to change it. Save your change. Go back to Netbeans and you will immediately see a popout screen asking you to enter your admin credentials. Enter admin for user and the password. That is it. If your Netbeans come with Glassfish, just right click the server then to View Domain Admin Console then follow the rest of the steps explained above