This is the first time I configure IPP so I hope this is a very basic

I have installed NDPS, SP5 and then iPrint on a netware 5.1 server.
I have created 2 ndps printers and when I go to the IPP Client Support
tab, the "allow IPP services for this printer" option is disabled and
greyed out. I can't check this option.
If I go to a web page and put http://<server_IP>:631/ipp, I receive "the
page cannot be displayed" message.