Can connect with IP number but not with machine name

Running MSDE2000A named instance on an XP Pro machine as part of a domain
(W2003 server) , connecting from a client: with a connection
'machinename\instancename' i get no connection ('server not found or accss
denied'); however with the same setup and a connection
'172.0.30.14\instancename' everything works as expected. I can use an alias
for the IP number and that works but an alias for the machine name does not.
With a DHCP server, the IP address isn't permanent so how do I configure the
connection in my application?More info - Colleagues have suggested that this is a simple DNS problem. But
I can connect to the machine using the DNS names in other apps (e.g. 'my
network Places') - it's just SQL that won't connect.
"quilkin" wrote:
> Running MSDE2000A named instance on an XP Pro machine as part of a domain
> (W2003 server) , connecting from a client: with a connection
> 'machinename\instancename' i get no connection ('server not found or accss
> denied'); however with the same setup and a connection
> '172.0.30.14\instancename' everything works as expected. I can use an alias
> for the IP number and that works but an alias for the machine name does not.
> With a DHCP server, the IP address isn't permanent so how do I configure the
> connection in my application?