I Think I found the missconfigured parts :-)! Thanks for pointing me into the right direction.
"notrust" and "restrict" where misconfigurred!
Now the clients have:
restrict IP mask 255.255.255.255 nomodify notrap noquery server IP
The server:
restrict IP mask 255.255.255.0 notrust nomodify notrap
You still need to get rid of the "notrust" on the server.
Paul.
