can ping but no forward reverse lookup

Hi

I've just added 2 new machines to the hosts file on our DNS. I can ping both using the FQDN or the ip address but I get the following answer to nslookup

*** server.name.columbia.edu can't find machine.name.columbia.edu: Non-existent host/domain

the nsswitch.conf file says hosts files dns and the resolv.conf file has domain the correct domain name and the nameserver has the correct ip address.

Why isn't the update to the hosts file being acknowledged ?

Thanks

Anna

[517 byte] By [annib70] at [2007-11-26 10:37:51]