kppp only works for root and knoppix

I have set up a new user. When I try KPPP nothing happens (it works in users knopppix and root).
I have put the new user in group "dialout"
Any suggestions appreciated.

As root,
Check the groups that knoppix can use:
groups knoppix
then
groups (newuser)
then add all of knoppix groups to (newuser)
addgroup (newuser) (goupname - example dialout)

I dont know which applies to kppp but then you have everything that knoppix has.

javascript:emoticon(':D') Thanks - That corrects the problem.