thanks to pierre nicolas
with security level 0, problem is solved
I'm not sure if it would be correct to say the problem is solved by setting security level to 2. You would be better off to get DNS correctly configured on your network and set the security level back to the default of 2.
I think a good test (PNR can confirm) is to run ... nslookup <server-name> , from your clients command prompt window. That should return a value instantaneously
Reuben