Once in while my OS 10.4.11 machine goes stupid, and has trouble resolving specific host names.
Opening a terminal window and entering:
sudo killall -HUP lookupd
fixes this. Lookupd is one of these more stupid Apple ideas. But since Cupertino has inherited the infallible attribute from the Roman Catholic Church it is pointless to tell them about it. Apple is so shiny and perfect to the outside. Inside it just looks like the Roman Catholic Church on the peak of it’s power.